88450domain: NAppears in sequencesa(n) = Sum_{k + l*m <= n} (k + l*m), with 0 <= k,l,m <= n.at n=34A106846a(n) = cpg(n, 3) + cpg(n, 4) + ... + cpg(n, n) where cpg(n, m) is the m-th n-th-order centered polygonal number.at n=27A257051Numbers k such that A173557(k) = A173557(k+1).at n=23A333874