id:A091454 - OEIS Search Results

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Integers n such that 3*phi(n) < n.

+0
2

30, 42, 60, 66, 78, 84, 90, 102, 114, 120, 126, 132, 138, 150, 156, 168, 174, 180, 186, 198, 204, 210, 222, 228, 234, 240, 246, 252, 258, 264, 270, 276, 282, 294, 300, 306, 312, 318, 330, 336, 342, 348, 354, 360, 366, 372, 378, 390, 396, 402, 408, 414, 420 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`If n is present so are all kn, k>1.` `The smallest odd number in this sequence is 111546435 = 35711...23. - T. D. Noe (noe(AT)sspectra.com), Jan 15 2004`
	MATHEMATICA	`Select[ Range[437], 3EulerPhi[ # ] < # & ]`
	CROSSREFS	`Cf. A000010, A054741, A091456.` `Sequence in context: A114816 A000977 A033992 this_sequence A136152 A090815 A093599` `Adjacent sequences: A091451 A091452 A091453 this_sequence A091455 A091456 A091457`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 10 2004`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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