Composite numbers k such that the sum of the divisors of k^2 is a prime.

Terms

a(0) =4a(1) =8a(2) =27a(3) =49a(4) =64a(5) =125a(6) =169a(7) =256a(8) =289a(9) =512a(10) =529a(11) =729a(12) =841a(13) =1849a(14) =2197a(15) =3125a(16) =4913a(17) =5329a(18) =6241a(19) =6889a(20) =15625a(21) =16129a(22) =29791a(23) =32768a(24) =37249a(25) =51529a(26) =57121a(27) =69169a(28) =76729a(29) =113569