Positions of primes in sequence (A246655) of primes and prime powers {p^i, i >= 1}.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =8a(5) =9a(6) =11a(7) =12a(8) =13a(9) =16a(10) =17a(11) =19a(12) =20a(13) =21a(14) =22a(15) =24a(16) =25a(17) =26a(18) =28a(19) =29a(20) =30a(21) =31a(22) =33a(23) =34a(24) =35a(25) =36a(26) =37a(27) =38a(28) =39a(29) =40