id:A023229 - OEIS Search Results

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Numbers n such that n and 8n + 3 are both prime.

+0
2

2, 5, 7, 13, 17, 31, 41, 43, 47, 61, 71, 73, 101, 103, 107, 113, 127, 131, 157, 163, 181, 191, 197, 223, 233, 241, 251, 281, 283, 293, 307, 317, 337, 367, 383, 421, 433, 443, 457, 461, 467, 491, 503, 563, 631, 643, 647, 653, 673, 677, 691, 733, 751, 761, 787, 797, 811 (list; graph; listen)

	OFFSET	`1,1`
	MAPLE	`a := proc (n) if isprime(n) = true and isprime(8*n+3) = true then n else end if end proc: seq(a(n), n = 1 .. 900); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Dec 26 2008]`
	CROSSREFS	`Cf. A005124, A007520 [Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 19 2008]` `Sequence in context: A082555 A160794 A092059 this_sequence A160676 A144300 A045353` `Adjacent sequences: A023226 A023227 A023228 this_sequence A023230 A023231 A023232`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified December 4 08:07 EST 2009. Contains 170310 sequences.

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