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Search: id:A138582
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| A138582 |
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Numbers n such that 2^(2*n-19)-19 is prime. |
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+0
1
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| 10, 11, 12, 13, 15, 17, 19, 20, 25, 29, 43, 44, 52, 88, 95, 105, 137, 155, 199
(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*15-19)-19=2029, 2^(2*17-19)-19=32749, ...
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MATHEMATICA
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q=19; 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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Sequence in context: A089951 A058945 A072554 this_sequence A066309 A107860 A058948
Adjacent sequences: A138579 A138580 A138581 this_sequence A138583 A138584 A138585
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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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