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 A086473 #18 Dec 20 2023 05:25:41 %S A086473 18,24,28,50,52,54,76,92,96,98,100,112,124,140,144,148,152,160,172, %T A086473 176,188,192,208,212,216,220,228,232,242,244,260,266,268,280,288,290, %U A086473 292,304,308,316,332,336,338,344,356,374,384,388,392,400,412,434,436,448 %N A086473 Numbers in A058080 having only one factor pair (both distinct from 1) that add up to a sum belonging to A014092. %C A086473 Related to the "Impossible Problem" of Martin Gardner. %D A086473 M. Criton, "Le Problème Impossible", Jeux Mathématiques, Tangente Hors Série No. 20 Pole Paris 2004. %H A086473 N. Hobson, Nick's Mathematical Miscellany, <a href="https://web.archive.org/web/20230314204853/http://www.qbyte.org/puzzles/p003s.html">Two Logicians</a> %H A086473 Dr. Rob, The Math Forum, <a href="https://web.archive.org/web/20180927044155/http://mathforum.org:80/library/drmath/view/55655.html">Two Mathematicians Problem</a> %e A086473 A058080(3)=18 is in the sequence because 18=2*9=3*6 and only 2+9=11 belongs to A014092. However, A058080(7)=30 is not in the sequence because 30=2*15=3*10=5*6 with both 2+15 and 5+6 belonging to A014092. %Y A086473 Cf. A058080, A014092. %K A086473 nonn %O A086473 1,1 %A A086473 _Lekraj Beedassy_, Sep 09 2003 %E A086473 Corrected and extended by _Ray Chandler_, Sep 21 2003