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A248918
a(n) = index of (n+1)-th prime power in A247665.
3
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
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
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Oct 16 2014
STATUS
approved