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A031291
Position of n-th 4 in A007376.
12
4, 19, 39, 59, 70, 72, 74, 76, 78, 79, 80, 82, 84, 86, 88, 99, 119, 139, 159, 179, 204, 234, 264, 294, 311, 314, 317, 320, 323, 324, 326, 329, 332, 335, 338, 354, 384, 414, 444, 474, 504, 534, 564, 594, 611, 614, 617, 620, 623, 624
OFFSET
1,1
COMMENTS
A007376(a(n)) = 4.
LINKS
PROG
(Haskell)
import Data.List (elemIndices)
a031291 n = a031291_list !! (n-1)
a031291_list = map (+ 1) $ elemIndices 4 a007376_list
-- Reinhard Zumkeller, Jul 28 2011
KEYWORD
nonn,less,base
STATUS
approved