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Search: id:A137389
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A137389 a(n) = 2^(prime(n)) + 2^(prime(n + 1)) +0
2
12, 40, 160, 2176, 10240, 139264, 655360, 8912896, 545259520, 2684354560, 139586437120, 2336462209024, 10995116277760, 149533581377536, 9147936743096320, 585467951558164480, 2882303761517117440, 149879795598890106880, 2508757194024499019776, 11805916207174113034240 (list; graph; listen)
OFFSET

1,1

EXAMPLE

a(3) = 160 because 2^5 + 2^7 = 160.

MATHEMATICA

f[n_] := 2^Prime[n] + 2^Prime[n + 1]; Array[f, 18] (* Robert G. Wilson v *)

CROSSREFS

Cf. A000040, A001043.

Sequence in context: A114815 A109766 A033586 this_sequence A012867 A114072 A022672

Adjacent sequences: A137386 A137387 A137388 this_sequence A137390 A137391 A137392

KEYWORD

nonn

AUTHOR

Max Sills (maxwell.sills(AT)case.edu), Apr 10 2008

EXTENSIONS

More terms from njas, Apr 10 2008

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Last modified September 5 01:44 EDT 2008. Contains 143476 sequences.


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