id:A051647 - OEIS Search Results

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Primes p such that 210p+1 is also prime.

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2, 3, 5, 7, 11, 13, 17, 23, 29, 47, 53, 59, 67, 73, 83, 89, 101, 137, 139, 157, 163, 179, 181, 191, 193, 223, 229, 251, 271, 277, 281, 313, 317, 347, 349, 353, 359, 401, 419, 421, 431, 433, 449, 457, 463, 479, 523, 577, 599, 601, 631, 653, 701, 709, 719, 727 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Analogous to A005384, Sophie Germain primes.`
	FORMULA	`p and A002110[4]*p+1=210p+1 are both primes`
	EXAMPLE	`Both 11 and 210*11+1=2311 are primes`
	CROSSREFS	`A005384, A005385, A007693.` `Sequence in context: A040067 A040087 A040065 this_sequence A042986 A143390 A038617` `Adjacent sequences: A051644 A051645 A051646 this_sequence A051648 A051649 A051650`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu)`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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