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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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3
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OFFSET
| 1,1
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MATHEMATICA
| 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
| Cf. A000523.
Sequence in context: A073313 A168382 A155701 * A180629 A096847 A011993
Adjacent sequences: A119526 A119527 A119528 * A119530 A119531 A119532
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KEYWORD
| more,nonn
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AUTHOR
| Jorge Coveiro (jorgecoveiro(AT)yahoo.com), Jul 27 2006
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EXTENSIONS
| One more term from Ryan Propper (rpropper(AT)stanford.edu), Jan 01 2007
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