Prime powers (p^k, p prime, k >= 1) such that k*p^k - 1 is also a power of a prime.

Terms

a(0) =2a(1) =3a(2) =4a(3) =5a(4) =8a(5) =9a(6) =17a(7) =25a(8) =49a(9) =64a(10) =121a(11) =169a(12) =257a(13) =289a(14) =729a(15) =841a(16) =1681a(17) =1849a(18) =3481a(19) =5329a(20) =11881a(21) =12769a(22) =16129a(23) =18769a(24) =24649a(25) =32041a(26) =32761a(27) =38809a(28) =39601a(29) =44521