Prime powers p^e with odd exponent e such that rho(p^(e+1)) is prime, where rho is A206369.

Terms

a(0) =8a(1) =27a(2) =32a(3) =125a(4) =243a(5) =512a(6) =1331a(7) =2048a(8) =32768a(9) =50653a(10) =79507a(11) =103823a(12) =131072a(13) =161051a(14) =177147a(15) =357911a(16) =1419857a(17) =2097152a(18) =2248091a(19) =3869893a(20) =11089567a(21) =15813251a(22) =16974593a(23) =20511149a(24) =28934443a(25) =69343957a(26) =115501303a(27) =147008443a(28) =263374721a(29) =536870912