A016644 Decimal expansion of log(21).

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

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• cons

Examples

			3.044522437723422996500597980365705434284575287404610640194084483575074....
		

References

• Milton Abramowitz and Irene 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
• Milton Abramowitz and Irene 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

Crossrefs

Cf. A016449 (continued fraction).

Programs

Mathematica

RealDigits[Log[21], 10, 120][[1]] (* Harvey P. Dale, Sep 04 2012 *)

PARI

default(realprecision, 20080); x=log(21); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b016644.txt", n, " ", d)); \\ Harry J. Smith, May 17 2009, corrected May 20 2009

Formula

Eqals A016630 + A002391. - R. J. Mathar, Jul 22 2025