id:A023204 - OEIS Search Results

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Numbers n such that n and 2n + 3 both prime.

+0
10

2, 5, 7, 13, 17, 19, 29, 43, 47, 53, 67, 73, 89, 97, 113, 127, 137, 139, 157, 167, 173, 193, 197, 199, 223, 227, 229, 269, 277, 283, 307, 337, 349, 353, 379, 383, 397, 409, 439, 463, 467, 487, 503, 509, 523, 547, 557, 563, 599, 607, 613, 617, 643, 647, 659, 739, 743, 773 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`f[n_]:=PrimeQ[2*n+3]; lst={}; Do[p=Prime[n]; If[f[p], AppendTo[lst, p]], {n, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 03 2009]`
	CROSSREFS	`Cf. A089530, A089531, A089532.` `Sequence in context: A161889 A069346 A023240 this_sequence A045352 A107426 A144256` `Adjacent sequences: A023201 A023202 A023203 this_sequence A023205 A023206 A023207`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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