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Search: id:A119529
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| A119529 |
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Numbers n such [Sum(x=1,n,(x-1)*2^(x-1))/2] is prime. |
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+0
4
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OFFSET
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1,1
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MATHEMATICA
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s = 0; Do[s += (x-1)*2^(x-1)/2; If[PrimeQ[s], Print[x]], {x, 10^4}] - Ryan Propper (rpropper(AT)stanford.edu), Jan 01 2007
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CROSSREFS
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Cf. A000523.
Sequence in context: A101932 A073313 A155701 this_sequence A096847 A011993 A154714
Adjacent sequences: A119526 A119527 A119528 this_sequence A119530 A119531 A119532
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KEYWORD
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more,nonn
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AUTHOR
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Jorge Coveiro (jorgecoveiro(AT)yahoo.com), Jul 27 2006
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EXTENSIONS
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One more term from Ryan Propper (rpropper(AT)stanford.edu), Jan 01 2007
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