Numbers n such that the average of the positive divisors of n^2 is a square.

Terms

a(0) =1a(1) =313a(2) =4077a(3) =42217a(4) =75848a(5) =1276101a(6) =2468936a(7) =8105257a(8) =13213921a(9) =23740424a(10) =76136648a(11) =172118709a(12) =249948601a(13) =296474857a(14) =309232296a(15) =772776968a(16) =1236329761a(17) =1254551521a(18) =2288805793a(19) =2372141576a(20) =2410951561a(21) =2536945441a(22) =3202075016a(23) =10065852072