OFFSET
0,2
EXAMPLE
PROG
(Haskell)
import Data.List (elemIndex); import Data.Maybe (fromJust)
a174904 = (+ 1) . fromJust . (`elemIndex` map a174903 [1..])
-- Reinhard Zumkeller, Sep 29 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Apr 01 2010
STATUS
approved