37250domain: NAppears in sequencesNumber of nondividing sets on {1,2,...,n}.at n=43A051014Numbers of the form (square + 1) that are not squarefree.at n=20A124809a(n) = 81*n^2 - 90*n + 26.at n=22A154295Central element of a series of 5 successive nonsquarefree numbers.at n=23A188296