Numbers k such that sum of divisors of k^2 is a square.

Terms

a(0) =1a(1) =9a(2) =20a(3) =180a(4) =1306a(5) =1910a(6) =11754a(7) =17190a(8) =32486a(9) =38423a(10) =47576a(11) =48202a(12) =50920a(13) =51590a(14) =83884a(15) =104855a(16) =132682a(17) =198534a(18) =247863a(19) =292374a(20) =300876a(21) =312374a(22) =313929a(23) =334330a(24) =345807a(25) =376095a(26) =428184a(27) =433818a(28) =458280a(29) =464310