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Search: id:A114056
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| A114056 |
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Numbers n such that 2^prime(n) - 1 + 10^n is prime. |
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1
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OFFSET
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1,2
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EXAMPLE
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7 is there because the 7th prime is 17, and 2^17-1+10^7 is prime.
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MATHEMATICA
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Position[PrimeQ[Table[(2^Prime[n] - 1) + 10^n, {n, 10}]], True]
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CROSSREFS
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Adjacent sequences: A114053 A114054 A114055 this_sequence A114057 A114058 A114059
Sequence in context: A103173 A098863 A053960 this_sequence A140221 A046668 A047533
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KEYWORD
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nonn
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AUTHOR
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Joao Carlos Leandro da Silva (zxawyh66(AT)yahoo.com), Feb 02 2006
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EXTENSIONS
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Edited by Don Reble (djr(AT)nk.ca), Jul 23 2006
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