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A138578 Numbers n such that 2^(2*n-7)-7 is prime. +0
1
4, 23, 361, 995, 1163, 1253 (list; graph; listen)
OFFSET

1,1

EXAMPLE

2^(2*23-7)-7=549755813881,

2^(2*361-7)-7=172364133221937103085272756482216056112753534658909761028039668631756215232006\

744379020625060744018369805777923479247838020220755974022884986972234404720831\

691332769255536872593544438018353486799545737272878084128761

MATHEMATICA

q=7; 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]

CROSSREFS

Sequence in context: A099692 A123637 A130890 this_sequence A107765 A145514 A024543

Adjacent sequences: A138575 A138576 A138577 this_sequence A138579 A138580 A138581

KEYWORD

nonn

AUTHOR

Vladimir Orlovsky (4vladimir(AT)gmail.com), May 13 2008

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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.


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