85675domain: NAppears in sequencesOdd composite n such that phi(n) * sigma(n) is one less than a square.at n=23A015722Expansion of Product_{m>=1} (1 + q^m)^(2*m).at n=16A026011Number of arrays of -3..3 integers x(1..n) with every x(i) in a subsequence of length 1 or 2 with sum zero.at n=9A193643