id:A110172 - OEIS Search Results

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Conjectured n such that phi(n)+phi(k)=phi(n+k) has no solution, where phi is Euler's totient function.

+0
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3, 15, 21, 39, 45, 57, 69, 105, 147, 165, 177, 195, 213, 273, 285, 315, 345, 393, 399, 465, 489, 525, 585, 615, 633, 645, 651, 681, 717, 777, 807, 813, 843, 855, 879, 885, 903, 915, 933, 939, 1005, 1035, 1041, 1065, 1095, 1149, 1263, 1281, 1293, 1317, 1395 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`All k<10^8 have been checked. All of these numbers are multiples of 3.`
	CROSSREFS	`Cf. A066426 (least k such that phi(n)+phi(k)=phi(n+k)).` `Adjacent sequences: A110169 A110170 A110171 this_sequence A110173 A110174 A110175` `Sequence in context: A074214 A036897 A129966 this_sequence A014493 A076825 A118565`
	KEYWORD	`nonn`
	AUTHOR	`T. D. Noe (noe(AT)sspectra.com), Jul 15 2005`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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