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A071576
a(n) = least k such that 2ik+1 is prime for all 1<=i<=n.
+0
11
1, 1, 1, 165, 5415, 12705, 256410, 256410, 6480303060, 217245863835, 946622690475, 35511547806735, 439116128090640
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 6 19:58 EST 2009. Contains 170429 sequences.
AT&T Labs Research
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