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A333100
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Even numbers k such that both k and k + 2 are nontotients (A005277).
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3
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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
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refs;
listen;
history;
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internal format)
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OFFSET
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1,1
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LINKS
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Amiram Eldar, Table of n, a(n) for n = 1..10000
Eric Weisstein's World of Mathematics, Nontotient.
Wikipedia, Nontotient.
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EXAMPLE
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74 is a term since both 74 and 76 are nontotients.
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PROG
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(PARI) forstep(k=2, 100, 2, if(!istotient(k) && !istotient(k+2), print1(k, ", ")))
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CROSSREFS
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Cf. A005277, A063512, A231964, A306952, A333101.
Sequence in context: A066132 A045283 A118221 * A270340 A300379 A300681
Adjacent sequences: A333097 A333098 A333099 * A333101 A333102 A333103
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KEYWORD
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nonn
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AUTHOR
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Amiram Eldar, Mar 07 2020
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STATUS
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approved
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