A274989 Decimal expansion of log(sqrt(10)).

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

Offset

1,3

Comments

This is the ratio between the bel and the neper, i.e., 1 bel = log(sqrt(10)) nepers.

Links

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

J. Valdes, The unit one, the neper, the bel and the future of the SI, Metrologia, Volume 39, Number 6 (2002), 543-550.

Wikipedia, Decibel

Index entries for transcendental numbers

Formula

Equals A002392/2. - Michel Marcus, Nov 19 2016

Example

1.1512925464970228420089957273...

Maple

evalf(log(sqrt(10)), 120);  # Alois P. Heinz, Apr 03 2020

Mathematica

RealDigits[Log[Sqrt[10]], 10, 90][[1]] (* Georg Fischer, Apr 03 2020 *)

Prog

(PARI) default(realprecision, 100)
digits(floor(10^100*log(sqrt(10)))) \\ Michel Marcus, Apr 03 2020

Crossrefs

Cf. A002392.

Sequence in context: A073324 A021665 A226613 * A328199 A289690 A088781

Adjacent sequences: A274986 A274987 A274988 * A274990 A274991 A274992

Keyword

nonn,cons

Author

Felix Fröhlich, Nov 11 2016

Extensions

a(29) ff. corrected and example truncated by Georg Fischer and Michel Marcus, Apr 03 2020

Offset corrected by Alois P. Heinz, Apr 03 2020

Status

approved