This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A085979 #12 Oct 30 2023 09:52:33 %S A085979 0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %T A085979 0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0, %U A085979 0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,1,1,1,1,1,2,1,1,1 %N A085979 Number of 5's in decimal expansion of prime(n). %H A085979 Reinhard Zumkeller, <a href="/A085979/b085979.txt">Table of n, a(n) for n = 1..10000</a> %t A085979 DigitCount[Prime[Range[100]],10,5] (* _Paolo Xausa_, Oct 30 2023 *) %o A085979 (Haskell) %o A085979 a085979 = count5 0 . a000040 where %o A085979 count5 c x | d == 5 = if x < 10 then c + 1 else count5 (c + 1) x' %o A085979 | otherwise = if x < 10 then c else count5 c x' %o A085979 where (x', d) = divMod x 10 %o A085979 -- _Reinhard Zumkeller_, Apr 08 2014 %Y A085979 Cf. 0's A085974, 1's A085975, 2's A085976, 3's A085977, 4's A085978, 6's A085980, 7's A085981, 8's A085982, 9's A085983. %K A085979 base,nonn %O A085979 1,102 %A A085979 _Jason Earls_, Jul 06 2003