id:A139392 - OEIS Search Results

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Odd noncyclic numbers; odd numbers n such that gcd(n,phi(n)) > 1.

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9, 21, 25, 27, 39, 45, 49, 55, 57, 63, 75, 81, 93, 99, 105, 111, 117, 121, 125, 129, 135, 147, 153, 155, 165, 169, 171, 175, 183, 189, 195, 201, 203, 205, 207, 219, 225, 231, 237, 243, 245, 253, 261, 273, 275, 279, 285, 289, 291, 297, 301, 305, 309, 315, 325 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Sequence A060679 lists all noncyclic numbers, which includes all even numbers >2.`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000`
	MATHEMATICA	`Select[Range[1, 400, 2], GCD[ #, EulerPhi[ # ]]>1&]`
	CROSSREFS	`Cf. A003277 (cyclic numbers).` `Sequence in context: A111171 A067887 A138786 this_sequence A091113 A108181 A053795` `Adjacent sequences: A139389 A139390 A139391 this_sequence A139393 A139394 A139395`
	KEYWORD	`nonn`
	AUTHOR	`T. D. Noe (noe(AT)sspectra.com), Apr 17 2008`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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