A001773 - OEIS

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A001773

Numbers n such that 13*2^n-1 is prime.
(Formerly M2686 N1076)

3, 7, 23, 287, 291, 795, 2203, 5711, 7927, 9443, 10095, 19071, 29611, 34651, 51875, 55343, 77511, 166303, 233207 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	REFERENCES	H. Riesel, ``Prime numbers and computer methods for factorization,'' Progress in Mathematics, Vol. 57, Birkhauser, Boston, 1985, Chap. 4, see pp. 381-384. `N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).` `N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).` `H. C. Williams and C. R. Zarnke, Math. Comp., 22 (1968), 420-422.`
	LINKS	`Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300` `Wilfrid Keller, List of primes k.2^n - 1 for k < 300` `Index entries for sequences of n such that k2^n-1 (or k2^n+1) is prime`
	CROSSREFS	`Cf. A032356, 132^n+1 is prime.` `Sequence in context: A121883 A060235 A090188 A067604 A090118 A099183` `Adjacent sequences: A001770 A001771 A001772 * A001774 A001775 A001776`
	KEYWORD	`hard,nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`More terms from Hugo Pfoertner (hugo(AT)pfoertner.org), Jun 23 2004`

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.