OFFSET
0,3
LINKS
PROG
(Haskell)
import Data.List (elemIndex); import Data.Maybe (fromJust)
a180077 = fromJust . (`elemIndex` a180076_list)
-- Reinhard Zumkeller, Mar 13 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Aug 14 2010
STATUS
approved