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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 2^(2*19-31)-31=97, 2^(2*21-31)-31=2017, 2^(2*22-31)-31=8161, ...
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MATHEMATICA
| 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
| Sequence in context: A004457 A115420 A145449 * A007636 A151977 A022106
Adjacent sequences: A138596 A138597 A138598 * A138600 A138601 A138602
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KEYWORD
| nonn
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AUTHOR
| Vladimir Orlovsky (4vladimir(AT)gmail.com), May 13 2008
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