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 A116352 #6 Jul 16 2021 21:34:11 %S A116352 3378,6617,7028,49941474,50058521,97000298,785321170881,799019801018, %T A116352 989301366861,997000002998,4044997109223942,4136014586911893, %U A116352 4248535260473902,4366325506691846,4457342984379797,5542657015620198 %N A116352 Numbers k such that k*(k+6) gives the concatenation of two numbers m and m+9. %e A116352 97000298 * 97000304 = 94090583//94090592, where // denotes concatenation. %Y A116352 Cf. A116174, A116345, A116351, A116353. %K A116352 nonn,base %O A116352 1,1 %A A116352 _Giovanni Resta_, Feb 06 2006