id:A078892 - OEIS Search Results

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Numbers n such that phi(n) - 1 is prime, where phi is Euler's totient function (A000010).

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5, 7, 8, 9, 10, 12, 13, 14, 15, 16, 18, 19, 20, 21, 24, 25, 26, 27, 28, 30, 31, 33, 35, 36, 38, 39, 42, 43, 44, 45, 49, 50, 51, 52, 54, 56, 61, 62, 64, 65, 66, 68, 69, 70, 72, 73, 77, 78, 80, 81, 84, 86, 90, 91, 92, 93, 95, 96, 98, 99, 102, 103, 104, 105, 109, 111, 112, 117 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`For all primes p: p is in the sequence iff p is the greater member of a twin prime pair (A006512), see A078893.` `Union of A006512 and A078893. - Ray Chandler (rayjchandler(AT)sbcglobal.net), May 26 2008`
	CROSSREFS	`Cf. A000010, A000040, A008864, A109606, A006512, A039698, A072281, A078893.` `Sequence in context: A043694 A043602 A038609 this_sequence A164374 A072281 A111339` `Adjacent sequences: A078889 A078890 A078891 this_sequence A078893 A078894 A078895`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 12 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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