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A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
2.55 Residue classes of primes. 2.56 Safe primes. 2.57 Self primes in base 10. ... is a natural number greater than 1 that has no positive divisors other than 1 and ...
The tables below list all of the divisors of the numbers 1 to 1000. A divisor of an integer n is an integer m , for which n / m is again an integer (which is necessarily also a divisor of n ). For example, 3 is a divisor of 21, since 21/7 = 3 (and therefore 7 is also a divisor of 21).
Name First elements Short description OEIS Mersenne prime exponents : 2, 3, 5, 7, 13, 17, 19, 31, 61, 89, ... Primes p such that 2 p − 1 is prime.: A000043 ...
The digital root pattern for triangular numbers, repeating every nine terms, as shown above, is "1, 3, 6, 1, 6, 3, 1, 9, 9". The converse of the statement above is, however, not always true. For example, the digital root of 12, which is not a triangular number, is 3 and divisible by three.
This is a list of number-one songs in the United States during the year 1955 according to Billboard magazine. Prior to the creation of the Billboard Hot 100 , Billboard published multiple singles charts each week.
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55 is: the 10th Fibonacci number [ 1 ] and the 10th triangular number , [ 2 ] The sum of 55's digits is also 10. the 5th heptagonal number , [ 3 ] the 5th square pyramidal number , [ 4 ] and the 4th centered nonagonal number .