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A137389
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a(n) = 2^(prime(n)) + 2^(prime(n + 1))
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1
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12, 40, 160, 2176, 10240, 139264, 655360, 8912896, 545259520, 2684354560, 139586437120, 2336462209024, 10995116277760, 149533581377536, 9147936743096320, 585467951558164480, 2882303761517117440, 149879795598890106880, 2508757194024499019776, 11805916207174113034240
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..20.
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FORMULA
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a(n)=A034785(n)+A034785(n+1). [From R. J. Mathar, Jun 15 2009]
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EXAMPLE
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a(3) = 160 because 2^5 + 2^7 = 160.
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MATHEMATICA
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f[n_] := 2^Prime[n] + 2^Prime[n + 1]; Array[f, 18] (* Robert G. Wilson v *)
Table[2^Prime[n] + 2^Prime[n + 1], {n, 1, 18}] - Stefan Steinerberger, Apr 12 2008
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CROSSREFS
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Cf. A000040, A001043.
Sequence in context: A033586 A211786 A180093 * A222806 A114072 A218712
Adjacent sequences: A137386 A137387 A137388 * A137390 A137391 A137392
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KEYWORD
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nonn
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AUTHOR
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Max Sills, Apr 10 2008
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EXTENSIONS
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More terms from N. J. A. Sloane, Apr 10 2008
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STATUS
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approved
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