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

1,1

Links

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

Eric Weisstein's World of Mathematics, Nontotient.

Wikipedia, Nontotient.

Example

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

Prog

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

Crossrefs

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

Sequence in context: A066132 A045283 A118221 * A270340 A300379 A300681

Adjacent sequences: A333097 A333098 A333099 * A333101 A333102 A333103

Keyword

nonn

Author

Amiram Eldar, Mar 07 2020

Status

approved