id:A023240 - OEIS Search Results

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Numbers n such that n and 10n + 9 both prime.

+0
6

2, 5, 7, 13, 17, 19, 23, 37, 41, 43, 47, 59, 61, 71, 73, 83, 101, 103, 127, 131, 139, 149, 157, 197, 199, 223, 233, 239, 257, 269, 271, 281, 293, 307, 311, 331, 349, 353, 373, 401, 409, 421, 433, 463, 467, 479, 491, 499, 503, 509, 541, 547, 563, 577, 587, 593, 607, 619 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`q=9; lst={}; Do[p=Prime[n]; If[PrimeQ[(q+1)*p+q], AppendTo[lst, p]], {n, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Mar 10 2009]`
	CROSSREFS	`Sequence in context: A065897 A161889 A069346 this_sequence A023204 A045352 A107426` `Adjacent sequences: A023237 A023238 A023239 this_sequence A023241 A023242 A023243`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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