https://wiki.20dage.dk/ 2026-04-24T17:40:41+00:00 https://wiki.20dage.dk/ https://wiki.20dage.dk/lib/tpl/dokuwiki/images/favicon.ico text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:algoritmer&rev=1697915948&do=diff Algortimer * N'th squarefree number text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:b-file_analyse&rev=1697915948&do=diff Tilbage til matematik B-files analyse Jeg har kigget på b000001.txt til b321963.txt. ---------- Stats * 172.234 “b-file synthesized from sequence entry” * 145.911 ikke “synthesized” * 3.818 a- og b-filer mangler. Dvs. alle fra 306.183 til 310.000 Problemer text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:collatz&rev=1697915948&do=diff * Collatz Factoring * Collatz Problem of Positive Integers * Highest Steps * OEIS Index text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:erdoes_paul&rev=1697915948&do=diff Tilbage til matematik ---------- Paul Erdös En film om Paul Erdös: N is a number text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:euler_problemer&rev=1697915947&do=diff Tilbage til Matematik ---------- Euler problemer Se NumSeq moduler på cpan: <http://search.cpan.org/~kryde/Math-NumSeq-61/> Nayjukis løsninger med forklaringer og java-source <http://nayuki.eigenstate.org/page/project-euler-solutions> * Hurtig Eulers totient funktion * Find prime factors * Problem 258 - lagged fibonacci * E549 -Divisibility of factorials * Carmichael's totient function conjecture text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:fermat&rev=1697915947&do=diff Tilbage til matematik ---------- v=7FnXgprKgSE text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:fibonacci&rev=1697915947&do=diff Fibonacci * Lagged fibonacci ---------- ---------- ---------- ---------- ---------- Formula til non-Fibonacci tal: text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:fraktaler&rev=1697915947&do=diff Fraktaler * Kalles fraktaler * <https://randomascii.wordpress.com/2011/08/13/faster-fractals-through-algebra/> text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:integration&rev=1697915948&do=diff Integration * How to solve EVERY trigonometric substitution * Trigonometric substitution with sine text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:jokes&rev=1697915948&do=diff Jokes text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:kolakoski_sequence&rev=1697915948&do=diff Kolakoski Sequence * bit tricks instead of recursion text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:konstanter&rev=1697915947&do=diff Matematiske konstanter <http://www.gutenberg.org/ebooks/634> text/html 2023-10-21T19:19:09+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:logik&rev=1697915949&do=diff Logik * Modal Logic text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:maengdelaere&rev=1697915948&do=diff Mængdelære notin: in: inter: union: exists: forall: subset:(subset) notsubset:(notsubset) propersubset: notpropersubset: superset:(superset) notsuperset:(notsuperset) propersuperset:(propersuperset) notpropersuperset:(notpropersuperset) text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:mandelbrot&rev=1697915948&do=diff Mandelbrot * Mandelbrot rendering * Superfractalthing Maths * Algorithmics Worlds * C. S. Larsen - JS Mandelbrot * Mandelbrot - tiles API * Buddhabrot text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:manglende_artikler_om_heltal&rev=1697915947&do=diff Tilbage til Artikler på Wikipedia med spændende matematik ---------- Manglende matematik artikler på wikipedia * 1002 1002 is a 17-gonal Number. 1002 is a 335-gonal Number. 1002 is a Centered 11-gonal Number. 22 can be Partitioned in 1002 ways. * <http://oeis.org/A006394> * <http://oeis.org/A005963> * <http://oeis.org/A006951> * <http://oeis.org/A000041> * <http://oeis.org/A004114> * <http://oeis.org/A035480> * <http://oeis.org/A039449> text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:mathsyntax&rev=1697915947&do=diff Math Publish examples Math publisher Help Page ---------- text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:matrix&rev=1697915947&do=diff * Matrix Multiplication text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:oeis&rev=1697915948&do=diff Tilbage til matematik ---------- * Kolakoski sequence * Ulam numbers On-Line Encyclopedia of Integer Sequences * b-file analyse Registrans * Confirm ---------- Jeg vil måske lave en DVD med OEIS. Flyingant skal være på dvd'en. ---------- Sekvenser med 2,3 eller 4 forskellige værdier. Nogle af dem kunne være interessante grafiske. text/html 2023-10-21T19:19:06+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:oeis_med_primtal&rev=1697915946&do=diff OEIS Primal * A137613 * A221869 * A167195 * A167170 * <http://arxiv.org/abs/0910.4676> text/html 2023-10-21T19:19:09+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:pi&rev=1697915949&do=diff PI * Bailey–Borwein–Plouffe Formula text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:primtal&rev=1697915948&do=diff Primtal * Finde alle faktorer * OEIS, der genererer primtal * A natural prime-generating recurrence * Generalizations of the Rowland theorem * Factor DB * Zhi-Wei Sun * Primality Testing code * Glitch Primes and Cyclops Numbers text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:primtal_faktorer&rev=1697915947&do=diff Prime Factorization * Pollard's Rho algorithm text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:puzzles&rev=1697915947&do=diff Puzzles * Latin Puzzles * There is no 16-Clue Sudoku text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:ramanujan_srinivasa&rev=1697915947&do=diff Tilbage til matematik RAMANUJAN SRINIVASA v=OARGZ1xXCxs text/html 2023-10-21T19:19:06+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:recreational_mathematics&rev=1697915946&do=diff Tilbage til matematik ---------- Recreational Mathematics * Ludus Opuscula text/html 2023-10-21T19:19:06+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:start&rev=1697915946&do=diff Matematik * The Benford Online Bibliography * Algoritmer * Collatz * Erdös, Paul * Euler problemer * Fermat * Fibonacci * Fraktaler * Integration * Konstanter * Mathsyntax * Matrix * Online Encyclopedia of Integer Sequences * Mængdelære * Mandelbrot * Jokes * Logik * PI * Primtal * Puzzles * Ramanujan, Srinivasa * Recreational Mathematics * Statistik * Store spændende tal * Tal-typer * Tidsskrifter * Tilfældige tal * Topologi * Wikipedia… text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:statistik&rev=1697915948&do=diff Statistik Anscombe's quartet text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:store_spaendende_tal&rev=1697915947&do=diff Tilbage til matematik ---------- Store (>1.000.000) spændende tal * 2147483647 * 9814072356 * 443372888629441 = 17·31·41·43·89·97·167·331 - mindste strong Fibonacci pseudoprime * , største kendte (sep. 2016) primtalstvilling. * Skewes' number * Graham's number * 121213882349 = * 128711132649 = (1287 + 1113 + 2649)^3 text/html 2023-10-21T19:19:06+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:tal-typer&rev=1697915946&do=diff Tilbage til matematik ---------- Tal-typer Primtal * Mersenne prime * Interprime * Cousin prime * Sexy prime * Twin prime * Fibonacci prime * Newman–Shanks–Williams prime * Pillai prime * Ramanujan prime * Wilson prime Fibonacci * Fibonacci text/html 2023-10-21T19:19:06+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:tidsskrifter&rev=1697915946&do=diff Tilbage til matematik ---------- Matematiske tidsskrifter * FAMØS text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:tilfaeldige_tal&rev=1697915948&do=diff Tilbage til Matematik ---------- Tilfældelige tal * rand() Considered Harmful video * Non-Uniform Random Variate Generation * A Million Random Digits with 100,000 Normal Deviates * Random number book * RANDU * Pseudorandom binary sequence * Books of random numbers - How were the numbers generated? text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:topologi&rev=1697915947&do=diff Tilbage til matematik ---------- Topologi En video om at vende en kugle inside-out: Youtube text/html 2023-10-21T19:19:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:ulam_numbers&rev=1697915947&do=diff Ulam numbers * An Efficient Method for Computing Ulam Numbers text/html 2023-10-21T19:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.20dage.dk/doku.php?id=matematik:wikipedia_artikler&rev=1697915948&do=diff Tilbage til Matematik ---------- Artikler på Wikipedia med spændende matematik * Manglende artikler om heltal * Artikler, der burde forbedres