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  2. 67 (number) - Wikipedia

    en.wikipedia.org/wiki/67_(number)

    67 (sixty-seven) is the natural number following 66 and preceding 68. It is an odd number. In mathematics. 67 is: the 19th prime number (the next is 71).

  3. List of prime numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_numbers

    A cluster prime is a prime p such that every even natural number k ≤ p − 3 is the difference of two primes not ... 19, 31, 43, 67, 79, 103, 127, 139, 151, 163 ...

  4. List of numbers - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/List_of_numbers

    A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

  5. 69 (number) - Wikipedia

    en.wikipedia.org/wiki/69_(number)

    69 is a semiprime because it is a natural number that is the product of exactly two prime numbers (3 and 23), and an interprime between the numbers of 67 and 71. [1] [2] 69 is not divisible by any square number other than 1, making it a square-free integer.

  6. 47 (number) - Wikipedia

    en.wikipedia.org/wiki/47_(number)

    47 (forty-seven) is the natural number following 46 and preceding 48. It is a prime number. It is the adopted favorite number of Pomona College, a liberal arts college in Southern California, whose alumni have added cultural references to it in numerous places, including many Star Trek episodes.

  7. 68 (number) - Wikipedia

    en.wikipedia.org/wiki/68_(number)

    As a decimal number, 68 is the last two-digit number to appear for the first time in the digits of pi. [14] It is a happy number, meaning that repeatedly summing the squares of its digits eventually leads to 1: [15] 68 → 6 2 + 8 2 = 100 → 1 2 + 0 2 + 0 2 = 1.

  8. 66 (number) - Wikipedia

    en.wikipedia.org/wiki/66_(number)

    The number of the French department Pyrénées-Orientales. The name of a German card game, translated from sechsundsechzig (see Sixty-six (game)). In telecommunications a 66 block is used to organize telephone lines. Sergio Mendes and Brasil '66 was a 1960s group. 66 WNBC radio was a popular New York radio station, which became WFAN on 1 July 1987.

  9. 63 (number) - Wikipedia

    en.wikipedia.org/wiki/63_(number)

    63 is the sum of the first six powers of 2 (2 0 + 2 1 + ... 2 5).It is the eighth highly cototient number, [1] and the fourth centered octahedral number after 7 and 25. [2] For five unlabeled elements, there are 63 posets.