id:A079445 - OEIS Search Results

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

+0
2

4, 5, 6, 7, 9, 10, 12, 13, 14, 18, 19, 21, 24, 26, 28, 31, 35, 38, 39, 40, 42, 43, 44, 45, 49, 50, 51, 54, 55, 58, 61, 63, 66, 68, 70, 72, 73, 74, 75, 76, 77, 84, 86, 90, 91, 92, 93, 94, 98, 99, 100 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`a(1)=4 as phi(4)=2, 2*[4-2]-1=3`
	PROGRAM	`(PARI) for (n=2, 100, if (isprime(eulerphi(n)*(n-eulerphi(n))-1), print1(n", ")))`
	CROSSREFS	`Cf. A079446.` `Sequence in context: A068521 A068318 A066485 this_sequence A120173 A075862 A088685` `Adjacent sequences: A079442 A079443 A079444 this_sequence A079446 A079447 A079448`
	KEYWORD	`nonn`
	AUTHOR	`Jon Perry (perry(AT)globalnet.co.uk), Jan 09 2003`

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

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