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 A116343 #7 Jul 17 2021 01:44:47 %S A116343 14,86,76983,714690,952314,90438191,96320544,32980078899029, %T A116343 34346653774238,42816188292273,42881990066488,57118009933512, %U A116343 57183811707727,65653346225762,67019921100971,81321742742210 %N A116343 Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+8. %e A116343 96320544 * 96320545 = 92776472//92776480, where // denotes concatenation. %Y A116343 Cf. A116172, A116329, A116344, A116348. %K A116343 nonn,base %O A116343 1,1 %A A116343 _Giovanni Resta_, Feb 06 2006