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 A077674 #4 Jun 23 2015 11:22:20 %S A077674 2,3,5,6,7,22,23,26,33,35,37,53,55,57,62,65,66,67,73,77,222,223,226, %T A077674 227,233,235,237,253,255,257,262,263,265,266,267,273,277,322,323,326, %U A077674 327,335,337,353,355,357,362,365,366,367,373,377,523,526,527,533,535 %N A077674 Squarefree numbers with nonzero squarefree digits (2,3,5,6,7). %C A077674 Here 1 is not considered a squarefree number. %K A077674 base,nonn %O A077674 1,1 %A A077674 _Amarnath Murthy_, Nov 16 2002 %E A077674 Corrected and extended by _David Garber_, Nov 19 2002