A085976 - OEIS

A085976

Number of 2's in decimal expansion of prime(n).

1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0

(list; graph; refs; listen; history; text; internal format)

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