217606domain: NAppears in sequencesSum T(n,k) of the entries in the k-th blocks of all set partitions of [n]; triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=37A285362Sum of the entries in the second blocks of all set partitions of [n].at n=7A285364Numbers k such that k * 15^k - 1 is prime.at n=10A299378