57233domain: NAppears in sequencesNumbers n such that n | 12^n + 11^n + 10^n + 9^n + 8^n + 7^n + 6^n + 5^n + 4^n + 3^n + 2^n.at n=21A057290Expansion of e.g.f.: exp(x + 2*x^2).at n=8A115329Square array A(n,k), n >= 0, k >= 1, read by antidiagonals, where column k is the expansion of e.g.f. exp(Sum_{j=1..k} j*x^j).at n=53A293718