A350321 Totient numbers k such that 14*k is a nontotient.

1, 22, 46, 52, 82, 148, 172, 178, 190, 250, 262, 292, 310, 358, 366, 382, 388, 442, 466, 490, 502, 506, 556, 562, 568, 586, 598, 652, 658, 682, 718, 742, 772, 822, 852, 862, 910, 946, 982, 1090, 1102, 1150, 1162, 1186, 1210, 1222, 1278, 1282, 1306, 1366, 1372

Offset: 1

Author

Jianing Song, Dec 24 2021

Keywords

• nonn

Comments

14 is the smallest even nontotient.

Examples

			52 is a term since 52 = phi(53) = phi(106), but phi(n) = 14*52 = 728 has no solution.
172 is a term since 172 = phi(173) = phi(346), but phi(n) = 14*172 = 2408 has no solution.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

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).

Cf. A002202, A005277.

Programs

PARI

isA350321(n) = istotient(n) && !istotient(14*n)