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 A117682 #3 Feb 27 2009 03:00:00 %S A117682 3,11,13,23,31,37,47,53,59,61,73,101,103,107,109,113,131,137,149,173, %T A117682 227,229,251,263,307,311,317,353,401,409,419,433,491,503,509,521,601, %U A117682 607,661,701,709,769,809,853,907,941,967,1009,1013,1019,1021,1031,1033 %N A117682 Prime numbers for which the product of the digits is a triangular number. %e A117682 59 is in the sequence because (1) it is a prime number and (2) the product of its digits 5*9=45 is a triangular number. %Y A117682 Cf. A000217. %K A117682 nonn,base %O A117682 1,1 %A A117682 Luc Stevens (lms022(AT)yahoo.com), Apr 27 2006