117720domain: NAppears in sequencesNumbers k such that k+1, 2k+1, 3k+1, 4k+1 are all prime.at n=30A237189Numbers that can be written as (x + y)(x^2 + y^2), x > y > 0, in at least two ways.at n=2A321492Expansion of e.g.f. 1 / (1 - x^3 * exp(x) / 3!).at n=10A346889