A016648 - OEIS

A016648

Decimal expansion of log(25).

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

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

OFFSET

1,1

REFERENCES

M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, 1964 (and various reprintings), p. 2.

LINKS

Harry J. Smith, Table of n, a(n) for n = 1..20000

M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].

Index entries for transcendental numbers

FORMULA

Equals 10 * Sum_{k>=1} F(k)^2/(k * 4^k), where F(k) is the k-th Fibonacci number (A000045). - Amiram Eldar, Aug 09 2020

Equals 2*A016628. - Alois P. Heinz, Aug 07 2023

EXAMPLE

3.218875824868200749201518666452375279051202708537035443825295782948357....

MATHEMATICA

RealDigits[Log[25], 10, 120][[1]] (* Vincenzo Librandi, Jun 21 2015 *)

PROG

(PARI) default(realprecision, 20080); x=log(25); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b016648.txt", n, " ", d)); \\ Harry J. Smith, May 19 2009

CROSSREFS

Cf. A000045, A016453 (continued fraction), A016628.

Sequence in context: A237596 A292898 A198498 * A366133 A104552 A210803

Adjacent sequences: A016645 A016646 A016647 * A016649 A016650 A016651

KEYWORD

nonn,cons

AUTHOR

N. J. A. Sloane

STATUS

approved