60290domain: NAppears in sequences"DHK" (bracelet, identity, unlabeled) transform of 1,2,3,4,...at n=15A032254Numbers n such that 4*10^n + R_n + 8 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=8A102983Numbers n such that A193232(n) is a triangular number.at n=16A220518