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A189824
Decimal expansion of Pogson's ratio 100^(1/5).
2
2, 5, 1, 1, 8, 8, 6, 4, 3, 1, 5, 0, 9, 5, 8, 0, 1, 1, 1, 0, 8, 5, 0, 3, 2, 0, 6, 7, 7, 9, 9, 3, 2, 7, 3, 9, 4, 1, 5, 8, 5, 1, 8, 1, 0, 0, 7, 8, 2, 4, 7, 5, 4, 2, 8, 6, 7, 9, 8, 8, 8, 4, 2, 0, 9, 0, 8, 2, 4, 3, 2, 4, 7, 7, 2, 3, 5, 6, 1, 3, 0, 8, 4, 5, 3, 8, 5, 1, 0, 0, 8, 8, 7, 7, 7, 9, 6, 9, 5, 9, 1, 9, 1, 6, 9
OFFSET
1,1
COMMENTS
Ratio appearing in the definition of the astronomical magnitude (brightness) scale.
Named after the English astronomer Norman Robert Pogson (1829-1891). - Amiram Eldar, Apr 24 2021
LINKS
Norman Pogson, Magnitudes of Thirty-Six of the Minor Planets for the First Day of Each Month of the Year 1857, Monthly Notices of the Royal Astronomical Society, Vol. 17, No. 1 (1856), pp. 12-15.
Eric Weisstein's World of Mathematics, Pogson's Ratio.
EXAMPLE
2.511886431509580111085032067799...
MATHEMATICA
First[RealDigits[100^(1/5), 10, 200]]
PROG
(PARI) 10^.4 \\ Charles R Greathouse IV, Jan 15 2015
(Magma) 10^(2/5) // G. C. Greubel, Jan 14 2018
CROSSREFS
Sequence in context: A024548 A376316 A197737 * A197814 A091772 A275479
KEYWORD
nonn,easy,cons
AUTHOR
Eric W. Weisstein, Apr 28 2011
STATUS
approved