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Golden Ratio Digits


The decimal digits of the golden ratio begin

 phi=1.618033988749894848...

(OEIS A001622). A computation to 10^(10) digits of precision was reported to take 24 CPU-minutes. Yee reports a computation of phi to 10^(12) decimal digits completed on Jul. 8, 2010.

The Earls sequence for phi gives the starting positions of n consecutive copies of the decimal representation of n, counting from 1 after the decimal point. For n=1, 2, ..., it begins 2, 62, 158, 1216, 72618, 2905357, 7446157, 41398949, 1574998166, ... (OEIS A224844).

The digit sequence 0123456789 does not occur in the first 10^(10) digits of phi, but 9876543210 does, starting at position 898007781 (E. Weisstein, Jul. 22, 2013).

Phi-primes, i.e., phi-constant primes occur for 7, 13, 255, 280, 97241, ... (OEIS A064119) decimal digits.

The starting positions of the first occurrence of n=0, 1, 2, ... in the decimal expansion of phi (including the initial 1 and counting it as the first digit) are 5, 1, 20, 6, 12, 23, 2, 11, 4, 8, 232, ... (OEIS A088577).

Scanning the decimal expansion of phi, including its initial 1, until all strings of n decimal digits have occurred, the last strings of lengths 1, 2, ... appearing are 5, 55, 515, 0092, 67799, 290503, ..., which end at positions 23, 770, 5819, 93910, 1154766, 13192647, ....

It is not known if phi is normal in base 10. The following table gives reported counts of each decimal digit d in the first 10^n decimal digits after the decimal point, for n=1, 2, ..., 10.

d\10^nOEIS1010010^310^410^510^610^710^810^910^(10)
011110010209986998051001143100033321000078401000031042
119105106299639999310001181000025599999864999990982
20111169949950995291000776100021161000021061000005392
3298810391007999833999794999918499979352999978183
40129297610041100151999367999879799995481999952470
50584988100161000679997259996151999999341000032985
619104918997510032899945599961491000042081000014191
711011310259988100160100085299975241000182371000023870
83151059871000810023610000591000541999995223999976728
919939919994998989987111000107399997755999994157

See also

Constant Digit Scanning, Constant Primes, Golden Ratio

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References

Sloane, N. J. A. Sequences A001622/M4046, A064119, A088577, and A224844 in "The On-Line Encyclopedia of Integer Sequences."Yee, A. J. "Golden Ratio." https://www.numberworld.org/digits/GoldenRatio/.

Referenced on Wolfram|Alpha

Golden Ratio Digits

Cite this as:

Weisstein, Eric W. "Golden Ratio Digits." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/GoldenRatioDigits.html

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