A333100 Even numbers k such that both k and k + 2 are nontotients (A005277).

74, 122, 152, 186, 234, 242, 244, 246, 284, 302, 338, 362, 374, 402, 404, 410, 412, 426, 434, 470, 472, 482, 494, 514, 516, 530, 532, 548, 572, 594, 602, 608, 626, 666, 668, 678, 722, 728, 746, 752, 788, 802, 804, 842, 844, 866, 868, 870, 872, 890, 892, 914, 942

Offset: 1

Author

Amiram Eldar, Mar 07 2020

Keywords

• nonn

Examples

			74 is a term since both 74 and 76 are nontotients.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000
• Eric Weisstein's World of Mathematics, Nontotient.
• Wikipedia, Nontotient.

Crossrefs

Cf. A005277, A063512, A231964, A306952, A333101.

Programs

PARI

forstep(k=2, 100, 2, if(!istotient(k) && !istotient(k+2), print1(k,", ")))