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A119571
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a(n) = 2^(2^n - 1) + 2^(2^(n + 1) - 1) + 1.
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0
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4, 11, 137, 32897, 2147516417, 9223372039002259457, 170141183460469231740910675752738881537, 57896044618658097711785492504343953926805133516280751251460479307672448925697
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OFFSET
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0,1
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COMMENTS
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Fermat-like sequence of powers of two.
Average of two consecutive Fermat numbers. - Juri-Stepan Gerasimov, Aug 26 2011.
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LINKS
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FORMULA
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a(n) = (A000215(n)+A000215(n+1))/2. - Juri-Stepan Gerasimov, Aug 26 2011.
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MATHEMATICA
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aa = Table[2^(2^n - 1) + 2^(2^(n + 1) - 1) + 1, {n, 0, 10}]
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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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