Numbers whose sum of divisors is a square.

Terms

a(0) =1a(1) =3a(2) =22a(3) =66a(4) =70a(5) =81a(6) =94a(7) =115a(8) =119a(9) =170a(10) =210a(11) =214a(12) =217a(13) =265a(14) =282a(15) =310a(16) =322a(17) =343a(18) =345a(19) =357a(20) =364a(21) =382a(22) =385a(23) =400a(24) =472a(25) =497a(26) =510a(27) =517a(28) =527a(29) =642