id:A070418 - OEIS Search Results

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Numbers n such that n and phi(n) have the same number of divisors.

+0
2

1, 3, 14, 15, 22, 28, 44, 46, 50, 56, 68, 70, 78, 88, 92, 94, 110, 112, 118, 166, 174, 176, 184, 188, 198, 214, 224, 228, 230, 234, 236, 255, 260, 294, 306, 318, 332, 334, 342, 352, 358, 368, 376, 414, 428, 448, 454, 462, 470, 472, 492, 500, 526, 550, 580, 590 (list; graph; listen)

	OFFSET	`1,2`
	PROGRAM	`(PARI) for(n=1, 900, if(numdiv(n)==numdiv(eulerphi(n)), print1(n, ", ")))`
	CROSSREFS	`Sequence in context: A127818 A138959 A055435 this_sequence A034120 A037244 A016062` `Adjacent sequences: A070415 A070416 A070417 this_sequence A070419 A070420 A070421`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), May 12 2002`

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Last modified September 7 15:23 EDT 2008. Contains 143483 sequences.

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