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A102604
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Numbers n such that ((2*n)^n-1)/(2*n-1) is prime.
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0
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OFFSET
| 1,1
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COMMENTS
| The next n in the sequence is > 4261 if exists
Note that (b^n-1)/(b-1) is prime only if n is prime, so all the elements in this sequence must be primes. - Marco Bodrato (marco2007(AT)bodrato.it), Oct 31 2007
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EXAMPLE
| (((2*2)^2)-1)/(2*2-1) = 15/3 = 5 prime so a(1)=2
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CROSSREFS
| Cf. A088790.
Sequence in context: A000317 A047024 A037843 * A119662 A163157 A000945
Adjacent sequences: A102601 A102602 A102603 * A102605 A102606 A102607
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KEYWORD
| more,nonn
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AUTHOR
| Pierre CAMI (pierre-cami(AT)bbox.fr), Jan 29 2005
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