A085978 Number of 4's in decimal expansion of prime(n).

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

Offset

1,86

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Mathematica

DigitCount[#, 10, 4]&/@Prime[Range[110]] (* Harvey P. Dale, May 30 2021 *)

Prog

(Haskell)
a085978 = count4 0 . a000040 where
   count4 c x | d == 4    = if x < 10 then c + 1 else count4 (c + 1) x'
              | otherwise = if x < 10 then c else count4 c x'
              where (x', d) = divMod x 10
-- Reinhard Zumkeller, Apr 08 2014

Crossrefs

Cf. 0's A085974, 1's A085975, 2's A085976, 3's A085977, 5's A085979, 6's A085980, 7's A085981, 8's A085982, 9's A085983.

Sequence in context: A124034 A332029 A211312 * A141044 A064284 A371807

Adjacent sequences: A085975 A085976 A085977 * A085979 A085980 A085981

Keyword

base,nonn

Author

Jason Earls, Jul 06 2003

Status

approved