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  2. Lucky number - Wikipedia

    en.wikipedia.org/wiki/Lucky_number

    In number theory, a lucky number is a natural number in a set which is generated by a certain "sieve". This sieve is similar to the sieve of Eratosthenes that generates the primes, but it eliminates numbers based on their position in the remaining set, instead of their value (or position in the initial set of natural numbers). [1]

  3. List of recreational number theory topics - Wikipedia

    en.wikipedia.org/wiki/List_of_recreational...

    This is a list of recreational number theory topics (see number theory, recreational mathematics). Listing here is not pejorative: many famous topics in number theory have origins in challenging problems posed purely for their own sake. See list of number theory topics for pages dealing with aspects of number theory with more consolidated theories.

  4. Lucky numbers of Euler - Wikipedia

    en.wikipedia.org/wiki/Lucky_numbers_of_Euler

    Leonhard Euler published the polynomial k 2 − k + 41 which produces prime numbers for all integer values of k from 1 to 40. Only 6 lucky numbers of Euler exist, namely 2, 3, 5, 11, 17 and 41 (sequence A014556 in the OEIS). [1] Note that these numbers are all prime numbers. The primes of the form k 2 − k + 41 are

  5. Here’s Why 7 Is Considered a Lucky Number - AOL

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  6. List of number theory topics - Wikipedia

    en.wikipedia.org/wiki/List_of_number_theory_topics

    This is a list of topics in number theory. See also: List of recreational number theory topics; Topics in cryptography; Divisibility. Composite number.

  7. List of bad luck signs - Wikipedia

    en.wikipedia.org/wiki/List_of_bad_luck_signs

    The number 17. Fear of the number 17 is known as heptadecaphobia and is prominent in Italian culture. [6] The number 39. Fear of the number 39 is known as the curse of 39, especially in Afghan culture. [7] The number 43. In Japanese culture, maternity wards numbered 43 are considered taboo, as the word for the number means "still birth". [8 ...

  8. List of lucky symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_lucky_symbols

    Sounds like the Chinese word for "fortune". See Numbers in Chinese culture#Eight. Used to mean the sacred and infinite in Japanese. A prime example is using the number 8 to refer to Countless/Infinite Gods (八百万の神, Yaoyorozu no Kami) (lit. Eight Million Gods). See 8#As a lucky number. Aitvaras: Lithuania [5] Acorns: Norse [6] Albatross

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