id:A023221 - OEIS Search Results

Search: id:A023221

Displaying 1-1 of 1 results found.

page 1

Numbers n such that n and 6n + 5 both prime.

+0
7

2, 3, 7, 11, 13, 17, 29, 31, 37, 41, 43, 59, 71, 73, 79, 83, 97, 107, 109, 113, 137, 139, 151, 157, 163, 181, 191, 193, 197, 227, 239, 241, 251, 263, 269, 277, 307, 311, 317, 337, 347, 349, 367, 373, 389, 401, 409, 421, 431, 443, 449, 479, 487, 499, 503, 541, 557, 577, 587 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`lst={}; Do[p=Prime[n]; If[PrimeQ[6*p+5], AppendTo[lst, p]], {n, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Mar 10 2009]`
	CROSSREFS	`Sequence in context: A045320 A045321 A045322 this_sequence A127430 A106483 A145673` `Adjacent sequences: A023218 A023219 A023220 this_sequence A023222 A023223 A023224`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

page 1

Search completed in 0.005 seconds

Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

AT&T Labs Research