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 A213534 #14 Jun 25 2023 03:38:14 %S A213534 11872177333,128907074146,153592049893,173277915346,218180421013, %T A213534 372099798262,468167023417,496310532853,499081630666,533381128933, %U A213534 569616671893,571632935206,579535129813,829161163813,866580745333,945276981106,945635700586,960970734706,975903758266 %N A213534 Numbers k such that A047988(k) = A047988(k+1) = 4. %C A213534 Kantke calls these numbers "Vierwertzwillinge", i.e., value-4-twins. %D A213534 Thomas Kantke, Das Spiel Minimum, in: Spektrum der Wissenschaft Spezial Physik - Mathematik - Technik 2/2012, pp. 57-66. %H A213534 Thomas Kantke, <a href="https://www.spektrum.de/magazin/das-spiel-minimum-und-die-zerlegung-natuerlicher-zahlen/820793">The game minimum and the decomposition of natural numbers</a>, Spectrum of Science 4/1993, page 11. %Y A213534 Cf. A047987, A047988. %K A213534 nonn %O A213534 1,1 %A A213534 _Martin Renner_, Jun 13 2012