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A138599
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Numbers n such that 2^(2*n-31)-31 is prime.
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0
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16, 17, 19, 21, 22, 24, 25, 33, 34, 36, 46, 49, 60, 70, 90, 93, 112, 137, 143, 207, 216, 263, 280, 477, 647, 1257, 1383
(list;
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refs;
listen;
history;
text;
internal format)
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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..27.
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EXAMPLE
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2^(2*19-31)-31=97, 2^(2*21-31)-31=2017, 2^(2*22-31)-31=8161, ...
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MATHEMATICA
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q=31; For[i=q, i<=q, a={}; Do[x=2^(2*n-i)-i; If[PrimeQ[x], AppendTo[a, n]], {n, 20^2}]; Print["2^(2*n-", i, ")-", i, " ", a]; i=i+2]
Select[Range[1500], PrimeQ[2^(2#-31)-31]&]
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PROG
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(PARI) is(n)=isprime(2^(2*n-31)-31) \\ Charles R Greathouse IV, Jun 13 2017
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CROSSREFS
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Sequence in context: A209726 A326455 A145449 * A258265 A261344 A007636
Adjacent sequences: A138596 A138597 A138598 * A138600 A138601 A138602
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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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EXTENSIONS
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More terms from Harvey P. Dale, Apr 08 2018
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STATUS
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approved
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