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 A101256 #15 Jan 11 2024 10:24:23
%S A101256 0,0,0,4,4,10,10,18,27,37,37,49,49,63,78,94,94,112,112,132,153,175,
%T A101256 175,199,224,250,277,305,305,335,335,367,400,434,469,505,505,543,582,
%U A101256 622,622,664,664,708,753,799,799,847,896,946,997,1049,1049,1103,1158,1214
%N A101256 Sum of composites <= n.
%F A101256 a(n) = A000217(n) - A034387(n) - 1 = A101203(n) - 1.
%t A101256 Accumulate[Table[If[n<2,0,If[PrimeQ[n], 0, n]], {n, 1, 100}]] (* _James C. McMahon_, Jan 07 2024 *)
%Y A101256 Cf. A065855, A002808.
%Y A101256 Cf. A000217, A034387, A101203.
%K A101256 nonn
%O A101256 1,4
%A A101256 _Reinhard Zumkeller_, Jan 23 2005