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 A333100 #9 Feb 16 2025 08:33:59 %S A333100 74,122,152,186,234,242,244,246,284,302,338,362,374,402,404,410,412, %T A333100 426,434,470,472,482,494,514,516,530,532,548,572,594,602,608,626,666, %U A333100 668,678,722,728,746,752,788,802,804,842,844,866,868,870,872,890,892,914,942 %N A333100 Even numbers k such that both k and k + 2 are nontotients (A005277). %H A333100 Amiram Eldar, <a href="/A333100/b333100.txt">Table of n, a(n) for n = 1..10000</a> %H A333100 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Nontotient.html">Nontotient</a>. %H A333100 Wikipedia, <a href="http://en.wikipedia.org/wiki/Nontotient">Nontotient</a>. %e A333100 74 is a term since both 74 and 76 are nontotients. %o A333100 (PARI) forstep(k=2, 100, 2, if(!istotient(k) && !istotient(k+2), print1(k,", "))) %Y A333100 Cf. A005277, A063512, A231964, A306952, A333101. %K A333100 nonn %O A333100 1,1 %A A333100 _Amiram Eldar_, Mar 07 2020