Numbers whose sum of divisors is prime.

Terms

a(0) =2a(1) =4a(2) =9a(3) =16a(4) =25a(5) =64a(6) =289a(7) =729a(8) =1681a(9) =2401a(10) =3481a(11) =4096a(12) =5041a(13) =7921a(14) =10201a(15) =15625a(16) =17161a(17) =27889a(18) =28561a(19) =29929a(20) =65536a(21) =83521a(22) =85849a(23) =146689a(24) =262144a(25) =279841a(26) =458329a(27) =491401a(28) =531441a(29) =552049