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A032388
Numbers k such that 77*2^k+1 is prime.
0
3, 7, 19, 23, 95, 287, 483, 559, 655, 667, 1639, 9399, 39639, 63883, 71575, 164319, 401947, 614995
OFFSET
1,1
PROG
(PARI) is(n)=ispseudoprime(77*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A018432 A205302 A127925 * A050866 A226923 A001985
KEYWORD
nonn
EXTENSIONS
More terms from Hugo Pfoertner, Jun 20 2003
More terms (from http://web.archive.org/web/20161028080239/http://www.prothsearch.net/riesel.html), Joerg Arndt, Apr 07 2013
STATUS
approved