Powers p^m, with prime p and m > 1, such that neither p^m-1 nor p^m+1 are squarefree.

Terms

a(0) =49a(1) =125a(2) =243a(3) =343a(4) =1681a(5) =1849a(6) =4913a(7) =6859a(8) =11449a(9) =24389a(10) =24649a(11) =29791a(12) =37249a(13) =57121a(14) =59049a(15) =63001a(16) =66049a(17) =68921a(18) =79507a(19) =85849a(20) =94249a(21) =117649a(22) =148877a(23) =161051a(24) =196249a(25) =208849a(26) =300763a(27) =310249a(28) =332929a(29) =351649