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A084713
Smallest prime of the form (2n-1)^k + 2, or 0 if no such number exists.
6
3, 5, 7, 0, 11, 13, 0, 17, 19, 0, 23, 952809757913929, 0, 29, 31, 0, 1091, 37, 0, 41, 43, 0, 47
OFFSET
1,1
COMMENTS
a(3n+1) = 0, a(24) = 47^113 - 2 is a 189-digit number.
EXAMPLE
a(12) = 952809757913927 = 23^11 + 2.
CROSSREFS
Cf. A084714.
Sequence in context: A223174 A225401 A085090 * A162538 A324990 A084712
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Jun 10 2003
EXTENSIONS
Edited by Robert G. Wilson v, Jun 11 2003
STATUS
approved