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Search: id:A138599
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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
1
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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
(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*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]
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CROSSREFS
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Sequence in context: A004457 A115420 A145449 this_sequence A007636 A151977 A022106
Adjacent sequences: A138596 A138597 A138598 this_sequence A138600 A138601 A138602
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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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