id:A119434 - OEIS Search Results

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A119434

Odd n such that 2*phi(n) < n.

+0
4

105, 165, 195, 315, 495, 525, 585, 735, 825, 945, 975, 1155, 1365, 1485, 1575, 1755, 1785, 1815, 1995, 2145, 2205, 2415, 2475, 2535, 2625, 2805, 2835, 2925, 3003, 3045, 3135, 3255, 3315, 3465, 3675, 3705, 3795, 3885, 3927, 4095, 4125, 4305, 4389, 4455 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Obviously 2phi(n) = n is impossible for odd n. Odd elements of A054741 and A119432. This is not the same as A036798. 684411 = 371323*109 is in this sequence but not in A036798. (This is may not be the smallest such value.) The primitive elements of this sequence are A119433, excluding the initial 2.`
	FORMULA	`A036798 UNION A118700. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 08 2007`
	CROSSREFS	`Cf. A000010, A054741, A119432.` `Sequence in context: A152940 A076762 A036798 this_sequence A091495 A046405 A128278` `Adjacent sequences: A119431 A119432 A119433 this_sequence A119435 A119436 A119437`
	KEYWORD	`nonn`
	AUTHOR	`Frank Adams-Watters (FrankTAW(AT)Netscape.net), May 19 2006`

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Last modified November 25 14:49 EST 2009. Contains 167514 sequences.

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