126960domain: NAppears in sequencesPeriod of the first difference of Ulam 1-additive sequence U(2,2n+1).at n=6A100729Number of subsets of {2..n} containing all of their integer quotients > 1.at n=23A326078Number of subsets of {1..n} containing all of their integer quotients > 1.at n=22A326079