id:A078752 - OEIS Search Results

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Least m>n such that phi(m) >= 2*phi(n), where phi is Euler's totient function (A000010).

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3, 3, 5, 5, 11, 7, 13, 11, 13, 11, 23, 13, 29, 17, 17, 17, 37, 19, 37, 23, 29, 23, 47, 25, 41, 29, 37, 29, 59, 31, 61, 37, 41, 37, 53, 37, 73, 41, 53, 41, 83, 43, 89, 47, 53, 47, 97, 49, 89, 53, 67, 53, 107, 55, 83, 59, 73, 59, 127, 61, 127, 67, 73, 67, 97, 67, 137, 71, 89, 71 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`For odd primes p: a(p-1) = p; the converse is not true, as e.g. a(25-1)=25.`
	CROSSREFS	`Sequence in context: A050822 A099536 A082434 this_sequence A124115 A124114 A077893` `Adjacent sequences: A078749 A078750 A078751 this_sequence A078753 A078754 A078755`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 22 2002`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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