id:A059242 - OEIS Search Results

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Numbers n such that 2^n + 5 is prime.

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1, 3, 5, 11, 47, 53, 141, 143, 191, 273, 341, 16541 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`2^3 + 5 = 13 is prime but 2^4 + 5 = 21 is not.`
	CROSSREFS	`Sequence in context: A105236 A144467 A049883 this_sequence A004203 A088884 A058029` `Adjacent sequences: A059239 A059240 A059241 this_sequence A059243 A059244 A059245`
	KEYWORD	`nonn,hard`
	AUTHOR	`Tony Davie (ad(AT)dcs.st-and.ac.uk), Jan 21 2001`
	EXTENSIONS	`More terms from Santi Spadaro, Oct 04, 2002` `16541 from Hans Havermann, Oct 07 2002`

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Last modified December 2 15:58 EST 2008. Contains 150992 sequences.