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  2. Composite number - Wikipedia

    en.wikipedia.org/wiki/Composite_number

    A composite number is a positive integer that can be formed by multiplying two smaller positive integers. Accordingly it is a positive integer that has at least one divisor other than 1 and itself. [1] [2] Every positive integer is composite, prime, or the unit 1, so the composite numbers are exactly the numbers that are not prime and not a unit.

  3. Rubber Duckie - Wikipedia

    en.wikipedia.org/wiki/Rubber_Duckie

    "Rubber Duckie" is a song sung by the Muppet character Ernie (performed by Jim Henson) on Sesame Street. The song is named after Ernie's toy, a rubber duck affectionately named Rubber Duckie. The song, written by Jeff Moss and arranged by Joe Raposo , was first heard by children watching an episode of Sesame Street on February 25, 1970. [ 1 ]

  4. Prime number - Wikipedia

    en.wikipedia.org/wiki/Prime_number

    The progressions of numbers that are 0, 3, or 6 mod 9 contain at most one prime number (the number 3); the remaining progressions of numbers that are 2, 4, 5, 7, and 8 mod 9 have infinitely many prime numbers, with similar numbers of primes in each progression.

  5. Super Simple Songs - Wikipedia

    en.wikipedia.org/wiki/Super_Simple_Songs

    Super Simple Songs is a Canadian YouTube channel and streaming media show created by Devon Thagard and Troy McDonald. They publish animated videos of both traditional nursery rhymes and their own original children's songs.

  6. List of prime numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_numbers

    This is a list of articles about prime numbers. A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes.

  7. Ulam spiral - Wikipedia

    en.wikipedia.org/wiki/Ulam_spiral

    The number 1 has only a single factor, itself; each prime number has two factors, itself and 1; composite numbers are divisible by at least three different factors. Using the size of the dot representing an integer to indicate the number of factors and coloring prime numbers red and composite numbers blue produces the figure shown.

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  9. 37 (number) - Wikipedia

    en.wikipedia.org/wiki/37_(number)

    37 is the first irregular prime with irregularity index of 1, [10] where the smallest prime number with an irregularity index of 2 is the thirty-seventh prime number, 157. [ 11 ] The smallest magic square , using only primes and 1 , contains 37 as the value of its central cell : [ 12 ]