OFFSET
1,1
COMMENTS
a(n) = A043689(n) + 1.
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
PROG
(Haskell)
a238248 n = a238248_list !! (n-1)
a238248_list = filter ((== 7) . a072219) [1..]
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Feb 20 2014
STATUS
approved