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 A350318 #13 Jul 19 2024 08:47:11 %S A350318 1,2,22,44,46,52,58,82,92,102,104,110,148,162,164,172,178,190,198,222, %T A350318 250,262,270,282,292,296,310,342,344,356,358,366,380,382,388,442,462, %U A350318 466,486,490,498,500,502,506,522,524,556,562,568,570,584,586,598,620 %N A350318 Totient numbers k such that 7*k is a nontotient. %H A350318 Amiram Eldar, <a href="/A350318/b350318.txt">Table of n, a(n) for n = 1..10000</a> %e A350318 44 is a term since 44 = phi(69) = phi(92) = phi(138), but phi(n) = 7*44 = 308 has no solution. %e A350318 52 is a term since 52 = phi(53) = phi(106), but phi(n) = 7*52 = 364 has no solution. %o A350318 (PARI) isA350318(n) = istotient(n) && !istotient(7*n) %Y A350318 Totient numbers k such that m*k is a nontotient: A350316 (m=3), A350317 (m=5), this sequence (m=7), A350319 (m=9), A350320 (m=10), A350321 (m=14). %Y A350318 Cf. A002202, A005277. %K A350318 nonn %O A350318 1,2 %A A350318 _Jianing Song_, Dec 24 2021