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 A116109 #6 Jul 21 2021 22:46:53 %S A116109 94,210,294,994,5880,9994,52888,99994,127044,414180,999994,8264470, %T A116109 9999994,12456750,41868508,99999994,112670544,441341880,468144040, %U A116109 669421494,702338994,715976338,750005718,960645294,999999994 %N A116109 Numbers k such that k concatenated with k-8 gives the product of two numbers which differ by 9. %e A116109 8505429358//8505429350 = 9222488466 * 9222488475, where // denotes concatenation. %Y A116109 Cf. A116193, A115429, A116114, A116240. %K A116109 nonn,base %O A116109 1,1 %A A116109 _Giovanni Resta_, Feb 06 2006