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A141083
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a(n) = 2^(p - 2)*(2^p - 2), where p = prime(n).
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0
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2, 12, 240, 4032, 1047552, 16773120, 4294901760, 68719214592, 17592181850112, 72057593769492480, 1152921503533105152, 4722366482800925736960, 1208925819613529663078400, 19342813113829668748787712
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OFFSET
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1,1
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LINKS
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FORMULA
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EXAMPLE
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Prime(1)=2, so a(1) = 2^(2 - 2)*(2^2 - 2) = 2^0*(4-2) = 2.
Prime(2)=3, so a(2) = 2^(3 - 2)*(2^3 - 2) = 2^1*(8-2) = 12.
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MATHEMATICA
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Table[2^(n-2) (2^n-2), {n, Prime[Range[20]]}] (* Harvey P. Dale, Aug 19 2014 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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