OFFSET
1,48
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
EXAMPLE
prime(4) = 7, so a(4)=0 and prime(2490) = 22229, so a(2490)=4.
MATHEMATICA
DigitCount[Prime[Range[110]], 10, 2] (* Harvey P. Dale, Jan 14 2014 *)
PROG
(Haskell)
a085976 = count2 0 . a000040 where
count2 c x | d == 2 = if x < 10 then c + 1 else count2 (c + 1) x'
| otherwise = if x < 10 then c else count2 c x'
where (x', d) = divMod x 10
-- Reinhard Zumkeller, Apr 08 2014
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Jason Earls, Jul 06 2003
STATUS
approved