A230979 - OEIS

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A230979

Decimal expansion of the time taken by light to travel one astronomical unit in a vacuum, measured in seconds.

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

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

3,1

COMMENTS

Decimal expansion of 149597870700/299792458 = 1024642950/2053373.

Has period 880014 since a(5). - Jianing Song, Jul 25 2022

LINKS

Table of n, a(n) for n=3..108.

Kevin Ryde, PARI/GP code calculating linear recurrence order

The XXVIII General Assembly of International Astronomical Union, On the re-definition of the astronomical unit of length, Resolution B2.

Wikipedia, Astronomical unit

Wikipedia, Speed of light

Index entries for linear recurrences with constant coefficients, order 440008.

FORMULA

au/c = A163103/A003678 = A163103*A182998.

EXAMPLE

au = 149597870700 meters. c = 299792458 meter/second.

au/c = 499.00478383615641191347115209949677920183035425127339... seconds.

PROG

(PARI) 149597870700/299792458. \\ To get a comma separated list of digits, use digits(%\.1^N), where N must be strictly less than the realprecision setting: e.g., %\.1^default(realprecision) yields an error due to insufficient precision. - M. F. Hasler, Sep 20 2017

CROSSREFS

Cf. A003678, A163103, A182998, A356070.

Sequence in context: A168175 A164382 A145521 * A145431 A196516 A021671

Adjacent sequences: A230976 A230977 A230978 * A230980 A230981 A230982

KEYWORD

nonn,cons,easy

AUTHOR

Omar E. Pol, Nov 03 2013

STATUS

approved