183645

Appears in sequences

• Number of non-equivalent (mod D_4) ways to arrange 4 points on an n X n square grid so that no three points are collinear.at n=7A235455
• a(n) is the least number k such that there are exactly n pairs (p,q) of primes with p<q such that p+q = 2*k and that 2*k+p, 2*k+q, p*q-2*k and p*q+2*k are primes.at n=41A354462