id:A023228 - OEIS Search Results

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Numbers n such that n and 8n + 1 are both prime.

+0
6

2, 5, 11, 17, 29, 71, 101, 107, 131, 137, 149, 179, 239, 269, 347, 401, 431, 449, 479, 491, 509, 557, 599, 617, 659, 677, 761, 809, 821, 857, 929, 941, 947, 977, 1151, 1187, 1229, 1289, 1307, 1361, 1367, 1409, 1487, 1559, 1571, 1601, 1619, 1667, 1697, 1811, 1871 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(MAGMA) [ p: p in PrimesUpTo(1900) \| IsPrime(8*p+1) ]; [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Dec 21 2008]`
	CROSSREFS	`Cf. A007519 (primes of form 8n+1), A005123 ((( primes == 1 mod 8 ) - 1)/8). [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Dec 21 2008]` `Sequence in context: A089440 A055499 A014424 this_sequence A027429 A059987 A027426` `Adjacent sequences: A023225 A023226 A023227 this_sequence A023229 A023230 A023231`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

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