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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
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13, 14, 15, 16, 17, 19, 29, 31, 41, 44, 59, 76, 77, 95, 107, 197
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..16.
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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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PROG
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(PARI) is(n)=isprime(2^(2*n-25)-25) \\ Charles R Greathouse IV, Jun 13 2017
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CROSSREFS
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Sequence in context: A296745 A178402 A132580 * A293831 A118140 A108854
Adjacent sequences: A138593 A138594 A138595 * A138597 A138598 A138599
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KEYWORD
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nonn,easy
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AUTHOR
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Vladimir Joseph Stephan Orlovsky, May 13 2008
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STATUS
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approved
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