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 A116344 #7 Jul 17 2021 01:44:50 %S A116344 464,535,717,821,3427,6572,90906,980201,3636360,6363639,41176467, %T A116344 58823532,413533837,426573429,428571425,432620008,567379991,571428574, %U A116344 573426570,586466162,686261110,725274728,727272724,731321307 %N A116344 Numbers k such that k*(k+2) gives the concatenation of two numbers m and m+8. %Y A116344 Cf. A115430, A116335, A116343, A116345. %K A116344 nonn,base %O A116344 1,1 %A A116344 _Giovanni Resta_, Feb 06 2006