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Search: id:A138596
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| A138596 |
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Numbers n such that 2^(2*n-25)-25 is prime. |
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+0
1
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| 13, 14, 15, 16, 17, 19, 29, 31, 41, 44, 59, 76, 77, 95, 107, 197
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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2^(2*16-25)-25=103, 2^(2*17-25)-25=487, 2^(2*19-25)-25=8167, ...
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MATHEMATICA
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q=25; For[i=q, i<=q, a={}; Do[x=2^(2*n-i)-i; If[PrimeQ[x], AppendTo[a, n]], {n, 10^2}]; Print["2^(2*n-", i, ")-", i, " ", a]; i=i+2]
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CROSSREFS
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Adjacent sequences: A138593 A138594 A138595 this_sequence A138597 A138598 A138599
Sequence in context: A004502 A020512 A132580 this_sequence A118140 A108854 A106007
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), May 13 2008
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