Numbers k such that Sum_{d|k} sigma(d)^3/d is an integer, where d are the divisors of k.

Terms

a(0) =1a(1) =201a(2) =981a(3) =1962a(4) =3663a(5) =7326a(6) =10791a(7) =12753a(8) =15879a(9) =21582a(10) =25506a(11) =30411a(12) =56898a(13) =60822a(14) =135749a(15) =140283a(16) =172161a(17) =212454a(18) =266727a(19) =280566a(20) =334521a(21) =344322a(22) =360027a(23) =395343a(24) =399267a(25) =407247a(26) =507177a(27) =625878a(28) =669042a(29) =720054