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 A101649 #17 Dec 02 2024 14:38:41 %S A101649 13,31,49,50,81,82,83 %N A101649 Atomic numbers of the poor metals on the periodic table. %C A101649 Elements 113, 114 and 115 are believed to be poor metals too. Element 116 could be either a poor metal or a metalloid. So I'm not putting the keyword full at this time. The poor metals are between the metalloids and the transition metals on the periodic table. %D A101649 The New Encyclopaedia Britannica, 15th Edition, 1991, Volume 15 (Macropedia), Chemical Elements. %H A101649 International Union of Pure and Applied Chemistry, <a href="https://iupac.org/what-we-do/periodic-table-of-elements/">Periodic Table of Elements</a> %H A101649 Wikipedia, <a href="http://en.wikipedia.org/wiki/Periodic_table">Periodic table</a>. %H A101649 Wikipedia, <a href="http://en.wikipedia.org/wiki/Poor_metal">Poor metals</a>. %e A101649 The atomic number of aluminium is 13. %Y A101649 Cf. A099955, alkali metals; A099956, alkaline earth metals; A101648, metalloids; A101647, nonmetals (except halogens and noble gases); A097478, halogens; A018227, noble gases; A101649, poor metals. %K A101649 fini,nonn %O A101649 1,1 %A A101649 Robert Happelberg (roberthappelberg(AT)yahoo.com), Dec 10 2004