Nonprime numbers k such that the sum of the divisors of k^2 is of the form m^2 + m + 1.

Terms

a(0) =1a(1) =4a(2) =6a(3) =22a(4) =48a(5) =64a(6) =390a(7) =429a(8) =638a(9) =682a(10) =880a(11) =2013a(12) =2310a(13) =2320a(14) =2968a(15) =2970a(16) =3625a(17) =4692a(18) =5696a(19) =5865a(20) =7772a(21) =9213a(22) =9715a(23) =9944a(24) =10778a(25) =11254a(26) =12963a(27) =13039a(28) =13704a(29) =15180