A248387 a(n) = index of n-th prime in A247665.

1, 2, 4, 5, 8, 9, 10, 11, 12, 14, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 29, 30, 33, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 56, 58, 59, 60, 61, 62, 64, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81

Offset: 1

Author

Russ Cox and N. J. A. Sloane, Oct 16 2014

Keywords

• nonn

Links

• Russ Cox and N. J. A. Sloane, Table of n, a(n) for n = 1..99436

Crossrefs

Cf. A247665, A248388, A248379.

Subsequence of A248918.

Programs

Haskell

import Data.List (elemIndex); import Data.Maybe (fromJust)
a248387 = (+ 1) . fromJust . (`elemIndex` a247665_list) . a000040
-- Reinhard Zumkeller, Oct 16 2014