5785101domain: NAppears in sequencesNumbers that are n-gons for three or more n's, where n=3,4,5,...,16.at n=20A062712Numbers that have exactly 10 representations as a k-gonal number, P(n,k) = n*((k-2)*n - (k-4))/2, k and n >= 3.at n=22A321160