OFFSET
1,169
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
EXAMPLE
prime(26) = 101, so a(26) = 1 and prime(1230) = 10007, so a(1230) = 3.
MATHEMATICA
DigitCount[Prime[Range[100]], 10, 0] (* Paolo Xausa, Oct 30 2023 *)
PROG
(Haskell)
a085974 = count0 0 . a000040 where
count0 c x | d == 0 = if x < 10 then c + 1 else count0 (c + 1) x'
| otherwise = if x < 10 then c else count0 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