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 A116147 #8 Jul 20 2021 23:45:15 %S A116147 4962,237412345332,262912791034,468307643502 %N A116147 Numbers k such that k concatenated with k-2 gives the product of two numbers which differ by 9. %C A116147 Also, numbers k such that k concatenated with k+6 gives the product of two numbers which differ by 7. %e A116147 4962//4960 = 7040 * 7049, where // denotes concatenation. %Y A116147 Cf. A116140, A116146, A116153, A116278. %Y A116147 Cf. A116195, A116200, A116202, A116209, A116332. %K A116147 nonn,base %O A116147 1,1 %A A116147 _Giovanni Resta_, Feb 06 2006 %E A116147 Edited by _N. J. A. Sloane_ at the suggestion of Eric Desbiaux, Mar 23 2008