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 A350321 #13 Jul 19 2024 08:47:44 %S A350321 1,22,46,52,82,148,172,178,190,250,262,292,310,358,366,382,388,442, %T A350321 466,490,502,506,556,562,568,586,598,652,658,682,718,742,772,822,852, %U A350321 862,910,946,982,1090,1102,1150,1162,1186,1210,1222,1278,1282,1306,1366,1372 %N A350321 Totient numbers k such that 14*k is a nontotient. %C A350321 14 is the smallest even nontotient. %H A350321 Amiram Eldar, <a href="/A350321/b350321.txt">Table of n, a(n) for n = 1..10000</a> %e A350321 52 is a term since 52 = phi(53) = phi(106), but phi(n) = 14*52 = 728 has no solution. %e A350321 172 is a term since 172 = phi(173) = phi(346), but phi(n) = 14*172 = 2408 has no solution. %o A350321 (PARI) isA350321(n) = istotient(n) && !istotient(14*n) %Y A350321 Totient numbers k such that m*k is a nontotient: A350316 (m=3), A350317 (m=5), A350318 (m=7), A350319 (m=9), A350320 (m=10), this sequence (m=14). %Y A350321 Cf. A002202, A005277. %K A350321 nonn %O A350321 1,2 %A A350321 _Jianing Song_, Dec 24 2021