401427domain: NAppears in sequencesPartial sums of A001037, omitting A001037(1).at n=21A001036Numbers n such that n+2, n+4, n+6, n+8, n+10, n+12 and n+14 are all semiprimes.at n=23A268578Number of (undirected) paths in the n-dipyramidal graph.at n=12A307918