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 A061820 #4 Dec 05 2013 19:54:52 %S A061820 0,4,12,20,24,32,40,44,100,104,112,120,124,132,140,144,200,204,212, %T A061820 220,224,232,240,244,300,304,312,320,324,332,340,344,400,404,412,420, %U A061820 424,432,440,444,1000,1004,1012,1020,1024,1032,1040,1044,1100,1104,1112 %N A061820 Multiples of 4 containing only digits 0,...,4. %e A061820 140 is a term containing digits less than 5. %t A061820 Select[4Range[0,400],Max[IntegerDigits[#]]<5&] (* _Harvey P. Dale_, Dec 20 2012 *) %Y A061820 Cf. A061818, A061819. %K A061820 nonn,base,easy %O A061820 0,2 %A A061820 _Amarnath Murthy_, May 28 2001 %E A061820 More terms from Larry Reeves (larryr(AT)acm.org), May 30 2001