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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 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 A030409 Adjacent sequences:  A085975 A085976 A085977 * A085979 A085980 A085981 KEYWORD base,nonn AUTHOR Jason Earls, Jul 06 2003 STATUS approved

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Last modified January 16 18:07 EST 2022. Contains 350376 sequences. (Running on oeis4.)