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A050863
Numbers n such that 223*2^n-1 is a prime.
0
3, 19, 91, 211, 699, 819, 1323, 4635, 38019, 307755
OFFSET
1,1
CROSSREFS
Sequence in context: A204256 A015528 A183384 * A376836 A283380 A049153
KEYWORD
hard,nonn
AUTHOR
N. J. A. Sloane, Dec 29 1999
EXTENSIONS
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
STATUS
approved