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A007516
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(2^2^...^2) (n times) + 1.
(Formerly M2504)
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5
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OFFSET
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0,2
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COMMENTS
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The next term already has 19729 digits and is too large to include. - Stefan Steinerberger, Apr 14 2006
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REFERENCES
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P. Ribenboim, The Book of Prime Number Records. Springer-Verlag, NY, 2nd ed., 1989, p. 73.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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FORMULA
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MATHEMATICA
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a[1] := 1; a[2] := 3; a[n_] := 2^(a[n - 1] - 1) + 1; Table[a[n], {n, 1, 5}] (* Stefan Steinerberger, Apr 14 2006 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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