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 A085980 #14 Jan 10 2023 05:06:37
%S A085980 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%T A085980 0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,
%U A085980 0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,0
%N A085980 Number of 6's in decimal expansion of prime(n).
%H A085980 Reinhard Zumkeller, <a href="/A085980/b085980.txt">Table of n, a(n) for n = 1..10000</a>
%t A085980 Table[DigitCount[n,10,6],{n,Prime[Range[110]]}] (* _Harvey P. Dale_, Mar 20 2018 *)
%o A085980 (Haskell)
%o A085980 a085980 = count6 0 . a000040 where
%o A085980 count6 c x | d == 6 = if x < 10 then c + 1 else count6 (c + 1) x'
%o A085980 | otherwise = if x < 10 then c else count6 c x'
%o A085980 where (x', d) = divMod x 10
%o A085980 -- _Reinhard Zumkeller_, Apr 08 2014
%Y A085980 Cf. 0's A085974, 1's A085975, 2's A085976, 3's A085977, 4's A085978, 5's A085979, 7's A085981, 8's A085982, 9's A085983.
%K A085980 base,nonn
%O A085980 1,121
%A A085980 _Jason Earls_, Jul 06 2003