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 A225067 #6 Sep 21 2013 07:30:20 %S A225067 7,6426,35224,2077992,3610893055,14209771072,118896888880, %T A225067 6400213601782,22535310978496008,22535310978496008, %U A225067 2418562185097611420000,2462278542548750181849600 %N A225067 Least heptagonal (7-gonal) number that is the product of n heptagonal numbers greater than 1. %H A225067 Lars Blomberg, <a href="/A225067/a225067.txt">Table of n, a(n) with solutions for n=1..12</a> %e A225067 Let hep(n) = n*(5n-3)/2. Then %e A225067 a(1) = 7 = hep(2). %e A225067 a(2) = 6426 = hep(51) = hep(4) * hep(9). %e A225067 a(3) = 35224 = hep(119) = hep(2) * hep(4) * hep(8). %e A225067 a(4) = 2077992 = hep(912) = hep(2)^2 * hep(3) * hep(31). %e A225067 a(5) = 3610893055 = hep(38005) = hep(2)^3 * hep(5) * hep(277). %e A225067 a(6) = 14209771072 = hep(75392) = hep(2)^4 * hep(31) * hep(32). %Y A225067 Cf. A000566 (heptagonal numbers). %Y A225067 Cf. A212616, A212617, A225066-A225070 (3-, 5- to 10-gonal cases). %K A225067 nonn,more %O A225067 1,1 %A A225067 _T. D. Noe_, May 01 2013 %E A225067 Corrected a(6) and added a(7)-a(12) by _Lars Blomberg_, Sep 21 2013