A248918 a(n) = index of (n+1)-th prime power in A247665.

1, 2, 3, 4, 5, 7, 6, 8, 9, 31, 10, 11, 12, 27, 28, 14, 16, 63, 17, 18, 19, 20, 32, 21, 22, 23, 127, 24, 25, 26, 29, 115, 30, 33, 34, 35, 36, 37, 38, 39, 40, 111, 41, 255, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 56, 58, 59, 60, 61, 62, 64, 66, 67

Offset

1,2

Links

Table of n, a(n) for n=1..66.

Prog

(Haskell)
import Data.List (elemIndex); import Data.Maybe (fromJust)
a248918 = (+ 1) . fromJust . (`elemIndex` a247665_list) . a000961 . (+ 1)

Crossrefs

Cf. A248387 (subsequence), A000961.

Sequence in context: A166277 A344009 A145342 * A318936 A088750 A056018

Adjacent sequences: A248915 A248916 A248917 * A248919 A248920 A248921

Keyword

nonn

Author

Reinhard Zumkeller, Oct 16 2014

Status

approved