id:A079446 - OEIS Search Results

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phi(n)*[n-phi(n)]+1 is prime.

+0
3

2, 3, 4, 5, 7, 8, 9, 11, 13, 17, 18, 19, 20, 21, 23, 25, 27, 28, 29, 31, 32, 37, 41, 43, 47, 50, 52, 53, 55, 56, 57, 59, 61, 67, 68, 71, 72, 73, 77, 78, 79, 81, 83, 89, 92, 95, 97, 99 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`phi(8)=4, so 4*[8-4]+1=17`
	PROGRAM	`(PARI) for (n=2, 100, if (isprime(eulerphi(n)*(n-eulerphi(n))+1), print1(n", ")))`
	CROSSREFS	`Cf. A079445.` `Sequence in context: A038701 A127072 A056781 this_sequence A115975 A087797 A153730` `Adjacent sequences: A079443 A079444 A079445 this_sequence A079447 A079448 A079449`
	KEYWORD	`nonn`
	AUTHOR	`Jon Perry (perry(AT)globalnet.co.uk), Jan 09 2003`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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