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 A079110 #15 Jul 21 2025 21:41:06 %S A079110 0,1,0,0,1,1,0,0,0,3,1,1,1,4,1,1,1,4,2,2,1,5,2,4,1,3,3,11,1,4,4,2,6,5, %T A079110 2,5,8,5,3,7,5,9,8,7,12,5,5,8,7,7,6,16,14,7,12,11,7,12,6,10,13,7,14, %U A079110 12,16,11,14,10,14,11,22,12,10,27,19,18,6,17,18,16,13,16,19,16,12,20,21,12,21,18,18 %N A079110 Number of 2's in n# (n primorial) = 2's in A002110(n). %H A079110 Alois P. Heinz, <a href="/A079110/b079110.txt">Table of n, a(n) for n = 0..10000</a> (999 terms from Vincenzo Librandi) %t A079110 DigitCount[#, 10, 2]&/@Rest[FoldList[Times, 1, Prime[Range[100]]]] (* _Vincenzo Librandi_, Apr 07 2014 *) %o A079110 (PARI) \\ See program in A079099. %Y A079110 Cf. A002110, A079099. %K A079110 nonn,base,easy %O A079110 0,10 %A A079110 _Cino Hilliard_, Feb 03 2003 %E A079110 Offset corrected by _Alois P. Heinz_, Jul 21 2025