References to A071576

a(n) = least k such that 2ik+1 is prime for all 1<=i<=n.
1, 1, 1, 165, 5415, 12705, 256410, 256410, 6480303060, 217245863835

1 seqfan posts

Sat Sep 19 23:56:16 CEST 2009    [seqfan] A164325: more terms
Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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