21351
domain: N
Appears in sequences
- Numbers k that divide prime(k^2) - 1.at n=20A067852
- Numbers that are the product of 3 distinct primes a,b and c, such that a+b+c, a^2+b^2+c^2 and a^3+b^3+c^3 are prime numbers.at n=24A176911
- a(n) = (1/3)*A290906(n).at n=9A290907
- a(n) = Sum_{k = n..2*n+1} k^2.at n=20A299646
- Number of vertices in an equilateral triangle "frame" of size n (see Comments in A328526 for definition).at n=14A333031
- Number of partitions of n such that 5*(greatest part) >= (number of parts).at n=36A347869