68403

Appears in sequences

• 3p^2 where p runs through the primes.at n=35A079705
• Number of undirected circular permutations i_0, i_1, ..., i_n of 0, 1, ..., n such that i_0+i_1, i_1+i_2, ...,i_{n-1}+i_n, i_n+i_0 are among those k with 6*k-1 and 6*k+1 twin primes.at n=15A228917
• Number of partitions of n*(n-1)/2 into at most three parts.at n=42A274233
• Numbers that can be represented in more than one way as p^2+p*q+q^2 with p and q primes, p<=q.at n=40A349987
• Numbers of the form p^2*q, with odd primes p > q, such that q divides p-1.at n=28A350638
• Number of compositions (ordered partitions) of n into Jacobsthal numbers 1,3,5,11,21,43, ... (A001045).at n=26A357519