cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-10 of 19 results. Next

A114493 Decimal expansion of log_10(4).

Original entry on oeis.org

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

Views

Author

Eric W. Weisstein, Dec 01 2005

Keywords

Comments

In engineering (all branches, but particularly electronic and electrical) power and amplitude ratios are measured rigorously in decibels (dB). This constant, with offset 1 (i.e., 6.02... = 10*A114493) is the dB equivalent of a 2:1 amplitude ratio or, equivalently, 4:1 power ratio. - Stanislav Sykora, Dec 11 2013

Examples

			0.602059991...

Links

Crossrefs

Cf. A000108, A114466.
Cf. decimal expansion of log_10(m): A007524 (m=2), A114490 (m=3), this sequence, A153268 (m=5), A153496 (m=6), A153620 (m=7), A153790 (m=8), A104139 (m=9), A154182 (m=11), A154203 (m=12), A154368 (m=13), A154478 (m=14), A154580 (m=15), A154794 (m=16), A154860 (m=17), A154953 (m=18), A155062 (m=19), A155522 (m=20), A155677 (m=21), A155746 (m=22), A155830 (m=23), A155979 (m=24).

Programs

Formula

A016627 divided by A002392. Two times A007524. - R. J. Mathar, Feb 21 2013
Equals 1/A154155. - R. J. Mathar, Jul 31 2025

A094148 Decimal expansion of log(3)/log(4).

Original entry on oeis.org

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

Views

Author

Benoit Cloitre, Jun 08 2004

Keywords

Comments

Gelfond showed abs( sup{ x in R} sum(0<=n

Examples

			0.79248125036057...

References

  • J.-P. Allouche & J. Shallit, Automatic sequences, Cambridge University Press, 2003, p 122

Links

Crossrefs

Cf. A010060.
Cf. decimal expansion of log_4(m): this sequence, A153201 (m=5), A153460 (m=6), A153615 (m=7), A154155 (m=10), A154176 (m=11), A154197 (m=12), A154224 (m=13), A154464 (m=14), A154543 (m=15), A154849 (m=17), A154909 (m=18), A155004 (m=19), A155183 (m=20), A155545 (m=21), A155695 (m=22), A155818 (m=23), A155936 (m=24).

Programs

Formula

Equals Integral_{x=1..oo} 1/(2^x - 2^(-x)) dx. - Amiram Eldar, Jul 16 2020

A153201 Decimal expansion of log_4 (5).

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane, Oct 30 2009

Keywords

Examples

			1.1609640474436811739351597147446950879324156965122903060273...

Links

Crossrefs

Cf. decimal expansion of log_4(m): A094148 (m=3), this sequence, A153460 (m=6), A153615 (m=7), A154155 (m=10), A154176 (m=11), A154197 (m=12), A154224 (m=13), A154464 (m=14), A154543 (m=15), A154849 (m=17), A154909 (m=18), A155004 (m=19), A155183 (m=20), A155545 (m=21), A155695 (m=22), A155818 (m=23), A155936 (m=24).

Programs

  • Mathematica
    RealDigits[Log[4, 5], 10, 100][[1]] (* Vincenzo Librandi, Aug 30 2013 *)

A153460 Decimal expansion of log_4 (6).

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane, Oct 30 2009

Keywords

Examples

			1.2924812503605780907268694719739082543799072038462405302278...

Links

Crossrefs

Cf. decimal expansion of log_4(m): A094148 (m=3), A153201 (m=5), this sequence, A153615 (m=7), A154155 (m=10), A154176 (m=11), A154197 (m=12), A154224 (m=13), A154464 (m=14), A154543 (m=15), A154849 (m=17), A154909 (m=18), A155004 (m=19), A155183 (m=20), A155545 (m=21), A155695 (m=22), A155818 (m=23), A155936 (m=24).

Programs

  • Mathematica
    RealDigits[Log[4, 6], 10, 100][[1]] (* Vincenzo Librandi, Aug 30 2013 *)

A153615 Decimal expansion of log_4 (7).

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane, Oct 30 2009

Keywords

Examples

			1.4036774610288020537209846586159154043205133129830703918386...

Links

Crossrefs

Cf. decimal expansion of log_4(m): A094148 (m=3), A153201 (m=5), A153460 (m=6), this sequence, A154155 (m=10), A154176 (m=11), A154197 (m=12), A154224 (m=13), A154464 (m=14), A154543 (m=15), A154849 (m=17), A154909 (m=18), A155004 (m=19), A155183 (m=20), A155545 (m=21), A155695 (m=22), A155818 (m=23), A155936 (m=24).

Programs

  • Mathematica
    RealDigits[Log[4,7],10,120][[1]] (* Harvey P. Dale, Feb 18 2013 *)

A154176 Decimal expansion of log_4 (11).

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane, Oct 30 2009

Keywords

Examples

			1.7297158093186486280996815233628964793516157628408840356564...

Links

Crossrefs

Cf. decimal expansion of log_4(m): A094148 (m=3), A153201 (m=5), A153460 (m=6), A153615 (m=7), A154155 (m=10), this sequence, A154197 (m=12), A154224 (m=13), A154464 (m=14), A154543 (m=15), A154849 (m=17), A154909 (m=18), A155004 (m=19), A155183 (m=20), A155545 (m=21), A155695 (m=22), A155818 (m=23), A155936 (m=24).

Programs

  • Mathematica
    RealDigits[Log[4, 11], 10, 100][[1]] (* Vincenzo Librandi, Aug 30 2013 *)

A154197 Decimal expansion of log_4 (12).

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane, Oct 30 2009

Keywords

Examples

			1.7924812503605780907268694719739082543799072038462405302278...

Links

Crossrefs

Cf. decimal expansion of log_4(m): A094148 (m=3), A153201 (m=5), A153460 (m=6), A153615 (m=7), A154155 (m=10), A154176 (m=11), this sequence, A154224 (m=13), A154464 (m=14), A154543 (m=15), A154849 (m=17), A154909 (m=18), A155004 (m=19), A155183 (m=20), A155545 (m=21), A155695 (m=22), A155818 (m=23), A155936 (m=24).

Programs

  • Mathematica
    RealDigits[Log[4, 12], 10, 100][[1]] (* Vincenzo Librandi, Aug 30 2013 *)

A154224 Decimal expansion of log_4 (13).

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane, Oct 30 2009

Keywords

Examples

			1.8502198590705460801984063271283473668142182008955186847692...

Links

Crossrefs

Cf. decimal expansion of log_4(m): A094148 (m=3), A153201 (m=5), A153460 (m=6), A153615 (m=7), A154155 (m=10), A154176 (m=11), A154197 (m=12), this sequence, A154464 (m=14), A154543 (m=15), A154849 (m=17), A154909 (m=18), A155004 (m=19), A155183 (m=20), A155545 (m=21), A155695 (m=22), A155818 (m=23), A155936 (m=24).

Programs

  • Mathematica
    RealDigits[Log[4, 13], 10, 100][[1]] (* Vincenzo Librandi, Aug 30 2013 *)

A154464 Decimal expansion of log_4 (14).

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane, Oct 30 2009

Keywords

Examples

			1.9036774610288020537209846586159154043205133129830703918386...

Links

Crossrefs

Cf. decimal expansion of log_4(m): A094148 (m=3), A153201 (m=5), A153460 (m=6), A153615 (m=7), A154155 (m=10), A154176 (m=11), A154197 (m=12), A154224 (m=13), this sequence, A154543 (m=15), A154849 (m=17), A154909 (m=18), A155004 (m=19), A155183 (m=20), A155545 (m=21), A155695 (m=22), A155818 (m=23), A155936 (m=24).

Programs

  • Mathematica
    RealDigits[Log[4, 14], 10, 100][[1]] (* Vincenzo Librandi, Aug 30 2013 *)

Formula

Equals 1/2 + A153615. - R. J. Mathar, Feb 01 2023

A154543 Decimal expansion of log_4 (15).

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane, Oct 30 2009

Keywords

Examples

			1.9534452978042592646620291867186033423123229003585308362552...

Links

Crossrefs

Cf. decimal expansion of log_4(m): A094148 (m=3), A153201 (m=5), A153460 (m=6), A153615 (m=7), A154155 (m=10), A154176 (m=11), A154197 (m=12), A154224 (m=13), A154464 (m=14), this sequence, A154849 (m=17), A154909 (m=18), A155004 (m=19), A155183 (m=20), A155545 (m=21), A155695 (m=22), A155818 (m=23), A155936 (m=24).

Programs

  • Mathematica
    RealDigits[Log[4,15],10,120][[1]] (* Harvey P. Dale, Jul 19 2011 *)
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