Numbers n such that the number of divisors of sum of divisors of n is prime.

Terms

a(0) =2a(1) =3a(2) =4a(3) =9a(4) =16a(5) =25a(6) =64a(7) =81a(8) =289a(9) =400a(10) =651a(11) =729a(12) =889a(13) =1681a(14) =2401a(15) =2667a(16) =3481a(17) =3937a(18) =4096a(19) =5041a(20) =7921a(21) =10201a(22) =15625a(23) =17161a(24) =27889a(25) =28561a(26) =29929a(27) =57337a(28) =65536a(29) =83521