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 A116179 #6 Jul 20 2021 23:47:44 %S A116179 1,3,81,1353,3997,7723,23761,26271,76771,1415683,3890571,8495497, %T A116179 1066870443,1239366513,4198438981,4534273891,6502317141,6918679731, %U A116179 2199164200036329043,2820114781174460091,5500888421709400741 %N A116179 Numbers k such that k concatenated with k+3 gives the product of two numbers which differ by 5. %Y A116179 Cf. A116172, A116112, A116180, A116193, A116310. %K A116179 nonn,base %O A116179 1,2 %A A116179 _Giovanni Resta_, Feb 06 2006