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A350316
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Totient numbers k such that 3*k is a nontotient.
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5
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1, 30, 58, 78, 82, 106, 130, 138, 150, 172, 178, 198, 222, 226, 238, 268, 282, 316, 342, 358, 366, 378, 382, 388, 418, 438, 462, 478, 498, 502, 506, 508, 546, 562, 570, 598, 606, 618, 630, 642, 646, 652, 658, 682, 690, 718, 738, 742, 772, 786, 810, 826, 838
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..53.
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EXAMPLE
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30 is a term since 30 = phi(31) = phi(62), but phi(n) = 3*30 = 90 has no solution.
58 is a term since 58 = phi(59) = phi(118), but phi(n) = 3*58 = 174 has no solution.
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PROG
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(PARI) isA350316(n) = istotient(n) && !istotient(3*n)
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CROSSREFS
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Totient numbers k such that m*k is a nontotient: this sequence (m=3), A350317 (m=5), A350318 (m=7), A350319 (m=9), A350320 (m=10), A350321 (m=14).
Cf. A002202, A005277.
Sequence in context: A154599 A048451 A154796 * A248572 A248739 A004962
Adjacent sequences: A350313 A350314 A350315 * A350317 A350318 A350319
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KEYWORD
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nonn
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AUTHOR
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Jianing Song, Dec 24 2021
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STATUS
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approved
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