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 A097603 #4 Feb 16 2025 08:32:54 %S A097603 6,12,18,24,28,30,36,42,48,54,56,60,66,72,78,84,90,96,102,108,112,114, %T A097603 120,126,132,138,140,144,150,156,162,168,174,180,186,192,196,198,204, %U A097603 210,216,222,224,228,234,240,246,252,258,264,270,276,280,282,288,294 %N A097603 Multiples of perfect numbers. %H A097603 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PerfectNumber.html">Perfect Number</a> %Y A097603 Cf. A000396. %K A097603 nonn %O A097603 1,1 %A A097603 _Reinhard Zumkeller_, Aug 30 2004