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A085978 Number of 4's in decimal expansion of prime(n). 10
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,86

LINKS

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

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: A131341 A124034 A211312 * A141044 A064284 A030409

Adjacent sequences:  A085975 A085976 A085977 * A085979 A085980 A085981

KEYWORD

base,nonn

AUTHOR

Jason Earls (zevi_35711(AT)yahoo.com), Jul 06 2003

STATUS

approved

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Last modified August 22 22:36 EDT 2017. Contains 290952 sequences.