546409576448domain: NAppears in sequencesDeficient numbers with increasing abundancy without being powers of 2.at n=25A228450Numbers k such that sigma(k) == 0 (mod k-8).at n=52A274562Numbers k such that A005187(k) < sigma(k) <= 2k, where A005187(k) = 2k - {binary weight of k}.at n=23A326138