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A350318
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Totient numbers k such that 7*k is a nontotient.
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5
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1, 2, 22, 44, 46, 52, 58, 82, 92, 102, 104, 110, 148, 162, 164, 172, 178, 190, 198, 222, 250, 262, 270, 282, 292, 296, 310, 342, 344, 356, 358, 366, 380, 382, 388, 442, 462, 466, 486, 490, 498, 500, 502, 506, 522, 524, 556, 562, 568, 570, 584, 586, 598, 620
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OFFSET
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1,2
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LINKS
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EXAMPLE
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44 is a term since 44 = phi(69) = phi(92) = phi(138), but phi(n) = 7*44 = 308 has no solution.
52 is a term since 52 = phi(53) = phi(106), but phi(n) = 7*52 = 364 has no solution.
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PROG
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(PARI) isA350318(n) = istotient(n) && !istotient(7*n)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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