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 A140897 #2 Mar 30 2012 17:25:51 %S A140897 1,4,11,26,39,59,93,110,148,174,218,255,321,353,410,471,536,594,685, %T A140897 739,816,878,990,1069,1171,1261,1374,1448,1580,1696,1837,1924,2049, %U A140897 2185,2307,2448,2620,2717,2874,3036,3185,3350,3514,3679,3841,3976,4201,4373 %N A140897 Positions of hexagonal numbers in the EKG sequence. %e A140897 The hexagonal number 4560 is located at position 4373 in the EKG sequence. %Y A140897 Cf. A000384, A064413. %K A140897 nonn %O A140897 1,2 %A A140897 _Parthasarathy Nambi_, Jul 24 2008