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OFFSET
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1,1
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COMMENTS
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Mills showed that there is a number A > 1 but not an integer, such that floor( A^(3^n) ) is a prime for all n = 1, 2, 3, ... A is approximately 1.306377883863... (see A051021).
Obverse of this is A118910 a(1) = 2; a(n) is greatest prime < a(n-1)^3. - Jonathan Vos Post, May 05 2006
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REFERENCES
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T. M. Apostol, Introduction to Analytic Number Theory, Springer-Verlag, 1976, page 8.
Chris K. Caldwell and Yuanyou Cheng, Determining Mills' Constant and a Note on Honaker's Problem, Journal of Integer Sequences, Vol. 8 (2005), Article 05.4.1.
W. H. Mills, A prime-representing function, Bull. Amer. Math. Soc., Vol. 53 (1947), p. 604.
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LINKS
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Robert G. Wilson v, Table of n, a(n) for n = 1..8
C. K. Caldwell, Mills' Theorem - a generalization
C. Caldwell and Yuanyou Chen, Determining Mills' Constant and a Note on Honaker's Problem, Journal of Integer Sequences, Vol. 8 (2005), Article 05.4.1.
S. R. Finch, Mills' Constant
Eric Weisstein's World of Mathematics, Mills Constant
Eric Weisstein's World of Mathematics, Prime Formulas
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FORMULA
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a(1) = 2; a(n) is least prime > a(n-1)^3. - Jonathan Vos Post, May 05 2006
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EXAMPLE
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a(3) = 1361 = 11^3 + 30 = a(2)^3 + 30 and there is no smaller k such that a(2)^3 + k is prime. - Jonathan Vos Post, May 05 2006
a(4) = 16022236204009818131831320183 = a(3)^3 + 80 = 2521008887^3 + 80 and there is no smaller k such that a(3)^3 + k is prime. - Jonathan Vos Post, May 05 2006
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MAPLE
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floor(A^(3^n), n=1..10); # A is Mills's constant: 1.306377883863080690468614492602605712916784585156713644368053759966434.. (A051021).
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MATHEMATICA
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p=1; Table[p=NextPrime[p^3], {6}] (* From T. D. Noe, Sep 24 2008 *)
NestList[NextPrime[#^3]&, 2, 5] (* From Harvey P. Dale, Feb 28 2012 *)
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CROSSREFS
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Cf. A001358, A055496, A076656, A006992, A005384, A005385, A118908, A118909, A118910, A118911, A118912, A118913, A051021, A108739.
Sequence in context: A034388 A131316 A062636 * A095820 A101295 A131306
Adjacent sequences: A051251 A051252 A051253 * A051255 A051256 A051257
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KEYWORD
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nonn,nice
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AUTHOR
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Simon Plouffe.
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EXTENSIONS
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Edited by N. J. A. Sloane, May 05 2007
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STATUS
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approved
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