Numbers n such that sum of divisors, sigma(n), and sum of the proper divisors, sigma(n)-n, are both square.

A176996

Numbers n such that sum of divisors, sigma(n), and sum of the proper divisors, sigma(n)-n, are both square.

Terms

    a(0) =1a(1) =3a(2) =119a(3) =527a(4) =935a(5) =3591a(6) =3692a(7) =6887a(8) =12319a(9) =47959a(10) =65151a(11) =97767a(12) =99116a(13) =202895a(14) =237900a(15) =373319a(16) =438311a(17) =699407a(18) =734111a(19) =851927a(20) =957551a(21) =1032156a(22) =1064124a(23) =1437599a(24) =1443959a(25) =2858687a(26) =3509231a(27) =3699311a(28) =4984199a(29) =7237415

External references