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 A077536 #8 Dec 05 2013 19:55:53 %S A077536 7,35,77,252,273,322,357,525,532,553,735,777,2233,2275,2352,2373,2527, %T A077536 2555,2723,2737,2772,3227,3255,3325,3332,3353,3535,3577,3752,3773, %U A077536 5222,5257,5327,5355,5523,5537,5572,5733,5775,7252,7273,7322,7357,7525,7532 %N A077536 Multiples of 7 using only prime digits (2, 3, 5 and 7). %t A077536 Select[7*Range[1100],And@@PrimeQ[IntegerDigits[#]]&] (* _Harvey P. Dale_, Jul 18 2011 *) %Y A077536 Cf. A077533, A077534, A077535. %K A077536 base,nonn %O A077536 0,1 %A A077536 _Amarnath Murthy_, Nov 08 2002 %E A077536 Corrected and extended by _Sascha Kurz_, Jan 03 2003