A282152 Decimal expansion of 20/log(10).

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

Offset

1,1

References

Herman Medwin, "Sounds in the Sea: From Ocean Acoustics to Acoustical", Cambridge University Press, 2005, pp. 68-70.

Links

Table of n, a(n) for n=1..105.

Wikipedia, Neper

Index entries for transcendental numbers

Formula

Equals 20*A002285 = 20/A002392.

Example

1 neper = 8.685889638 dB.
8.685889638065036553022578378332101645887940116073331322289075663317292984177...

Mathematica

RealDigits[20/Log[10], 10, 111][[1]] (* Robert G. Wilson v, Feb 20 2017 *)

Prog

(Magma) SetDefaultRealField(RealField(105)); n:=20/Log(10); Reverse(Intseq(Floor(10^104*n)));
(PARI) 20/log(10)

Crossrefs

Cf. A002392.

Sequence in context: A011298 A355185 A188655 * A191909 A247559 A246768

Adjacent sequences: A282149 A282150 A282151 * A282153 A282154 A282155

Keyword

nonn,cons

Author

Arkadiusz Wesolowski, Feb 20 2017

Status

approved