id:A055517 - OEIS Search Results

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Largest integer k such that k | Phi(k) - d(k) + n, or 0 if no such k exists, where d() is the number of divisors.

+0
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30, 4, 12, 0, 1, 4, 9, 2, 25, 4, 49, 15, 14, 27, 121, 35, 169, 33, 26, 55, 289, 77, 361, 91, 38, 85, 529, 143, 46, 133, 44, 187, 841, 221, 961, 247, 62, 253, 42, 323, 1369, 217, 74, 391, 1681, 437, 1849, 403, 86, 493, 2209 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`In the case of n = 3, the condition is satisfied for all the primes.`
	EXAMPLE	`for a(2), 12 \| [ Phi(12) + d(12) + 2 ].`
	CROSSREFS	`Cf. A020488.` `Sequence in context: A040889 A040882 A040883 this_sequence A040884 A040880 A040881` `Adjacent sequences: A055514 A055515 A055516 this_sequence A055518 A055519 A055520`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 03 2000`

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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.

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