id:A023212 - OEIS Search Results

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Numbers n such that n and 4n + 1 both prime.

+0
6

3, 7, 13, 37, 43, 67, 73, 79, 97, 127, 139, 163, 193, 199, 277, 307, 373, 409, 433, 487, 499, 577, 619, 673, 709, 727, 739, 853, 883, 919, 997, 1033, 1039, 1063, 1087, 1093, 1123, 1129, 1297, 1327, 1423, 1429, 1453, 1543, 1549, 1567, 1579, 1597, 1663, 1753 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`lst={}; Do[p=Prime[n]; If[PrimeQ[4*p+1], AppendTo[lst, p]], {n, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 16 2009]`
	CROSSREFS	`Sequence in context: A112040 A084611 A078454 this_sequence A106952 A106951 A106057` `Adjacent sequences: A023209 A023210 A023211 this_sequence A023213 A023214 A023215`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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