Numbers that are not powers of primes p^k (k >= 0); complement of A000961.

Terms

a(0) =6a(1) =10a(2) =12a(3) =14a(4) =15a(5) =18a(6) =20a(7) =21a(8) =22a(9) =24a(10) =26a(11) =28a(12) =30a(13) =33a(14) =34a(15) =35a(16) =36a(17) =38a(18) =39a(19) =40a(20) =42a(21) =44a(22) =45a(23) =46a(24) =48a(25) =50a(26) =51a(27) =52a(28) =54a(29) =55