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  2. List of integer sequences - Wikipedia

    en.wikipedia.org/wiki/List_of_integer_sequences

    0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11, 22, 10, 23, 9, 24, 8, 25, 43, 62, ... "subtract if possible, otherwise add" : a (0) = 0; for n > 0, a ( n ) = a ( n − 1) − n if that number is positive and not already in the sequence, otherwise a ( n ) = a ( n − 1) + n , whether or not that number is already in the sequence.

  3. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    A tiling with squares whose side lengths are successive Fibonacci numbers: 1, 1, 2, 3, 5, 8, 13 and 21 The Fibonacci numbers were first described in Indian mathematics as early as 200 BC in work by Pingala on enumerating possible patterns of Sanskrit poetry formed from syllables of two lengths.

  4. Generalizations of Fibonacci numbers - Wikipedia

    en.wikipedia.org/wiki/Generalizations_of...

    In mathematics, the Fibonacci numbers form a sequence defined recursively by: = {= = + > That is, after two starting values, each number is the sum of the two preceding numbers.

  5. NYT ‘Connections’ Hints and Answers Today, Sunday, February 23

    www.aol.com/nyt-connections-hints-answers-today...

    Today's Connections Game Answers for Sunday, February 23, 2025: 1. RUB TOGETHER: GNASH, GRATE, GRIND, SCRAPE 2. WAYS TO PRESERVE FOOD: CAN, FERMENT, FREEZE, PICKLE 3 ...

  6. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    For example, for 2 5 a + 1 there are 3 increases as 1 iterates to 2, 1, 2, 1, and finally to 2 so the result is 3 3 a + 2; for 2 2 a + 1 there is only 1 increase as 1 rises to 2 and falls to 1 so the result is 3a + 1.

  7. Intransitive dice - Wikipedia

    en.wikipedia.org/wiki/Intransitive_dice

    Die B has sides 1, 1, 6, 6, 8, 8. Die C has sides 3, 3, 5, 5, 7, 7. The probability that A rolls a higher number than B , the probability that B rolls higher than C , and the probability that C rolls higher than A are all ⁠ 5 / 9 ⁠ , so this set of dice is intransitive.

  8. Table of prime factors - Wikipedia

    en.wikipedia.org/wiki/Table_of_prime_factors

    Many properties of a natural number n can be seen or directly computed from the prime factorization of n.. The multiplicity of a prime factor p of n is the largest exponent m for which p m divides n.

  9. Golomb ruler - Wikipedia

    en.wikipedia.org/wiki/Golomb_ruler

    0 2 3 10 16 21 25 0 2 7 13 21 22 25: c. 1967 [19] John P. Robinson and Arthur J. Bernstein 8: 34: 0 1 4 9 15 22 32 34: 1972 [19] William Mixon 9: 44: 0 1 5 12 25 27 35 41 44: 1972 [19] William Mixon 10: 55: 0 1 6 10 23 26 34 41 53 55: 1972 [19] William Mixon 11: 72: 0 1 4 13 28 33 47 54 64 70 72 0 1 9 19 24 31 52 56 58 69 72: 1972 [19] William ...