A132997 -id:A132997 - cp's OEIS frontend

A167526 Prime factors of the speed of light in a vacuum, c = 299792458 (m/s).

2, 7, 73, 293339

Offset: 1

M. F. Hasler, Nov 18 2009

Note that each prime factor of 299792458 appears with multiplicity 1 in this number.

Giving the speed of light in km/s or cm/s would yield the same prime factors > 5. If time is measured in hours, or distance in miles, feet, inches or similar, then the numerical value of c is no longer an integer.

Cf. A003678 (speed of light), A132997 (all divisors of c, contains this as subsequence).

FactorInteger[299792458][[All, 1]] (* Paolo Xausa, Jul 02 2024 *)

PARI
```
factor(299 792 458)~[1,]
```

299792458 = 2 * 7 * 73 * 293339.

A182997 Decimal expansion of c/(2*Pi), where c = 299792458 (exactly) is the speed of light in vacuum (m/s).

Original entry on oeis.org

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

Offset: 8

Omar E. Pol, Dec 17 2010

Decimal expansion of 149896229/Pi.

			47713451.592369422588888983337736450234612537898340668812014...
If the circumference of a circle is equal to 299792458 meters then the radius is equal to 47713451.59... meters.

Cf. A000796, A003678, A019692, A086201, A132997, A167526.

RealDigits[299792458/(2Pi),10,120][[1]] (* Harvey P. Dale, Feb 09 2019 *)

x=299792458/(2*Pi)/10^7; for(k=1, 100, my(d=floor(x)); x=(x-d)*10; print1(d, ", ")) \\ Felix Fröhlich, Mar 31 2018

Equals A003678 / A019692 = A003678 * A086201. - Omar E. Pol, Mar 18 2018

Edited by N. J. A. Sloane, Dec 18 2010

cp's OEIS Frontend

A167526 Prime factors of the speed of light in a vacuum, c = 299792458 (m/s).

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