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 A138593 #7 Mar 23 2016 11:49:13 %S A138593 10,15,20,21,25,27,28,30,33,35,36,39,40,42,44,45,49,50,51,52,54,55,56, %T A138593 57,60,63,65,66,68,69,70,72,75,76,77,78,80,81,84,85,87,88,90,91,92,93, %U A138593 95,98,99,100,102,104,105,108,110,111,112,114,115,116,117,119,120,121 %N A138593 Sums of 5 or more consecutive nonnegative integers. %C A138593 Also: the numbers of the form s*k+A000217(k-1), s>=0, k>=5. Changing the lower limit to k from 5 to 2, 4 or 6 also defines A138591, A138592 and A138594. [From _R. J. Mathar_, Jul 31 2008] %H A138593 Ray Chandler, <a href="/A138593/b138593.txt">Table of n, a(n) for n = 1..10000</a> %e A138593 0+1+2=3+4=10, 1+2+3+4+5=15, 2+3+4+5+6=20, 1+2+3+4+5+6=21,... %t A138593 Array[r,9];k=0;For[i=0,i<=55,a=i*4+6;For[j=i+4,j<=66,a=a+j;k++;r[k]=a;j++ ];i++ ];q=Union[Array[r,k]];StringTake[ToString[q],123] %K A138593 nonn %O A138593 1,1 %A A138593 _Vladimir Joseph Stephan Orlovsky_, May 13 2008 %E A138593 More terms from _Vladimir Joseph Stephan Orlovsky_, Mar 07 2010