259 (Japanese Wikipedia)

Analysis of information sources in references of the Wikipedia article "259" in Japanese language version.

refsWebsite

Global rank Japanese rank

742^nd place

1,117^th place

oeis.org

The composite numbers: numbers n of the form x*y for x > 1 and y > 1. Table of n, a(n) for n = 1..17737
Semiprimes (or biprimes): products of two primes. Table of n, prime(n) for n = 1..10000
d(n) a(n) = sigma(n), the sum of the divisors of n. Also called sigma_1(n). Table of n, a(n) for n = 1..100000
Deficient numbers: numbers k such that sigma(k) < 2k. Table of n, prime(n) for n = 1..10000
Numbers that are the sum of 3 nonzero squares in exactly 2 ways. Table of n, a(n) for n = 1...418
Numbers that are the sum of 4 positive cubes in 1 or more way. Table of n, a(n) for n = 1...10000