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 A077535 #10 Oct 19 2017 03:14:08 %S A077535 72,222,252,372,522,552,732,2232,2322,2352,2532,2772,3222,3252,3372, %T A077535 3522,3552,3732,5232,5322,5352,5532,5772,7272,7332,7572,7722,7752, %U A077535 22272,22332,22572,22722,22752,23232,23322,23352,23532,23772,25272 %N A077535 Multiples of 6 with only prime digits (2, 3, 5 and 7). %C A077535 There are 4^n/12 + O(1) n-digit terms in this sequence. - _Charles R Greathouse IV_, Jul 15 2016 %Y A077535 Cf. A077533, A077534. %K A077535 base,nonn %O A077535 1,1 %A A077535 _Amarnath Murthy_, Nov 08 2002 %E A077535 Corrected and extended by _Sascha Kurz_, Jan 03 2003 %E A077535 Corrected and extended by _Don Reble_, Nov 20 2006