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Search: id:A138602
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| A138602 |
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Numbers n such that 2^(2*n-39)-39 is prime. |
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1
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OFFSET
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1,1
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EXAMPLE
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2^(2*23-39)-39=89, 2^(2*32-39)-39=33554393, 2^(2*33-39)-39=134217689, 2^(2*83-39)-39=170141183460469231731687303715884105689,
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MATHEMATICA
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q=39; For[i=q, i<=q, a={}; Do[x=2^(2*n-i)-i; If[PrimeQ[x], AppendTo[a, n]], {n, 12^3}]; Print["2^(2*n-", i, ")-", i, " ", a]; i=i+2]
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CROSSREFS
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Sequence in context: A008553 A007930 A133895 this_sequence A030605 A063780 A125663
Adjacent sequences: A138599 A138600 A138601 this_sequence A138603 A138604 A138605
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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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