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A069857
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Decimal expansion of -C, where C = -0.2959050055752... is the real solution < 0 to zeta(x) = x.
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7
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2, 9, 5, 9, 0, 5, 0, 0, 5, 5, 7, 5, 2, 1, 3, 9, 5, 5, 6, 4, 7, 2, 3, 7, 8, 3, 1, 0, 8, 3, 0, 4, 8, 0, 3, 3, 9, 4, 8, 6, 7, 4, 1, 6, 6, 0, 5, 1, 9, 4, 7, 8, 2, 8, 9, 9, 4, 7, 9, 9, 4, 3, 4, 6, 4, 7, 4, 4, 3, 5, 8, 2, 0, 7, 2, 4, 5, 1, 8, 7, 7, 9, 2, 1, 6, 8, 7, 1, 4, 3, 6, 0, 2, 1, 7, 1, 5
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OFFSET
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0,1
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COMMENTS
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Start from any complex number z=x+iy, not solution to zeta(z)=z, iterate the zeta function on z. If zeta_m(z)=zeta(zeta(....(z)..)) m times, has a limit when m grows, then this limit seems to always be the real number C = -0.2959050055752....
C is not only a real fixed point of zeta, but the only attractive fixed point of Riemann zeta on the real line. - Balarka Sen, Feb 21 2013
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LINKS
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EXAMPLE
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Let z=3+5I after 30 iterations : zeta_30(z)=-0.29590556499...-0.00000041029065...*I
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MATHEMATICA
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FindRoot[Zeta[z] - z, {z, 0}, WorkingPrecision -> 500] (* Balarka Sen, Feb 21 2013 *)
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PROG
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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