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A050589
Numbers n such that 127*2^n-1 is prime.
0
25, 113, 39545, 170393, 220417
OFFSET
1,1
PROG
(PARI) is(n)=ispseudoprime(127*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A044276 A044657 A160437 * A340123 A247683 A020152
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