50888domain: NAppears in sequencesNumbers whose base-15 representation has exactly 5 runs.at n=21A043672Numbers k such that 2^(k(k-1)) == 8 (mod k).at n=6A126662Number of partitions of sigma(n) into divisors of n, where sigma = A000203.at n=39A306387Numbers k such that A075255(k) is the square of a prime.at n=30A386954