

A156590


Decimal expansion of the imaginary part of the limit of f(f(...f(0)...)) where f(z)=sqrt(i+z).


3



6, 2, 4, 8, 1, 0, 5, 3, 3, 8, 4, 3, 8, 2, 6, 5, 8, 6, 8, 7, 9, 6, 0, 4, 4, 4, 7, 4, 4, 2, 8, 5, 1, 4, 4, 4, 0, 0, 5, 2, 3, 4, 4, 5, 6, 4, 1, 9, 0, 0, 2, 3, 2, 7, 4, 7, 0, 1, 5, 4, 3, 1, 4, 6, 5, 3, 1, 7, 1, 0, 5, 5, 4, 3, 9, 4, 9, 6, 4, 0, 7, 0, 5, 2, 4, 5, 2, 8, 9, 1, 2, 7, 5, 5, 3, 2, 9, 5, 0, 9, 1, 7, 3, 1, 7
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OFFSET

0,1


COMMENTS

The real part, 1.300242590..., is given by A156548.
Coincides with the limit of the imaginary part of the same expression, but with f(z)=i/(1+z), and therefore with the imaginary part of the continued fraction i/(1+i/(1+i/(...))). It is also equal to the real part of the continued fraction i/(i+i/(i+i/(...))).  Stanislav Sykora, May 27 2015


LINKS

Table of n, a(n) for n=0..104.


FORMULA

Define z(1)=f(0)=sqrt(i), where i=sqrt(1), and z(n)=f(z(n1)) for n>1.
Write the limit of z(n) as a+bi where a and b are real. Then a=(b+1)/(2b), where b=sqrt((sqrt(17)1)/8).


EXAMPLE

0.6248105338...


MATHEMATICA

RealDigits[Sqrt[(Sqrt[17]1)/8], 10, 120][[1]] (* Vaclav Kotesovec, May 28 2015 *)


CROSSREFS

Cf. A156548.
Sequence in context: A202244 A257535 A020831 * A135617 A019930 A169843
Adjacent sequences: A156587 A156588 A156589 * A156591 A156592 A156593


KEYWORD

nonn,cons


AUTHOR

Clark Kimberling, Feb 12 2009


STATUS

approved



