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 A374373 #7 Jul 07 2024 13:51:26 %S A374373 1,2850,61776,79800,103740,145530,437580,719400,810901,828828,1050525, %T A374373 1185030,1788886,2031120,2162160,2821500,4250070,4959675,9217071, %U A374373 12298320,12457536,16356340,22899528,23334696,24890040,30728880,32800950,45158256,48565440,58487520 %N A374373 Hexagonal numbers that are products of smaller hexagonal numbers. %C A374373 There are infinitely many terms where the corresponding product has two factors. This can be proved by solving a certain generalized Pell equation, as in A374372. %e A374373 1 is a term because it is a hexagonal number and equals the empty product. %e A374373 2850 is a term because it is a hexagonal number and equals the product of the hexagonal numbers 15 and 190. %e A374373 103740 is a term because it is a hexagonal number and equals the product of the hexagonal numbers 6, 91, and 190. (This is the first term that requires more than two factors.) %Y A374373 Row n=6 of A374370. %Y A374373 Cf. A000384, A374372. %K A374373 nonn %O A374373 1,2 %A A374373 _Pontus von Brömssen_, Jul 07 2024