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 1-3 of 3 results.

A004226 a(n) = 1000*log_10(n) rounded to the nearest integer.

Original entry on oeis.org

0, 301, 477, 602, 699, 778, 845, 903, 954, 1000, 1041, 1079, 1114, 1146, 1176, 1204, 1230, 1255, 1279, 1301, 1322, 1342, 1362, 1380, 1398, 1415, 1431, 1447, 1462, 1477, 1491, 1505, 1519, 1531, 1544
Offset: 1

Views

Author

N. J. A. Sloane

Keywords

Crossrefs

Cf. A004225, A004227.
Cf. A004220, A004223, A004229.

A004229 a(n) = 10000*log_10(n) rounded to the nearest integer.

Original entry on oeis.org

0, 3010, 4771, 6021, 6990, 7782, 8451, 9031, 9542, 10000, 10414, 10792, 11139, 11461, 11761, 12041, 12304, 12553, 12788, 13010, 13222, 13424, 13617, 13802, 13979, 14150, 14314, 14472, 14624
Offset: 1

Views

Author

N. J. A. Sloane

Keywords

Crossrefs

Cf. A004228, A004230.
Cf. A004220, A004223, A004226.

Programs

  • Mathematica
    Round[10000*Log10[Range[30]]] (* Harvey P. Dale, Aug 22 2018 *)

A371933 a(n) = 20*log_10(n) rounded to the nearest integer.

Original entry on oeis.org

0, 6, 10, 12, 14, 16, 17, 18, 19, 20, 21, 22, 22, 23, 24, 24, 25, 25, 26, 26, 26, 27, 27, 28, 28, 28, 29, 29, 29, 30, 30, 30, 30, 31, 31, 31, 31, 32, 32, 32, 32, 32, 33, 33, 33, 33, 33, 34, 34, 34, 34, 34, 34, 35, 35, 35, 35, 35, 35, 36, 36, 36, 36, 36, 36
Offset: 1

Views

Author

Charles L. Hohn, Jul 03 2024

Keywords

Comments

When the amplitude of a wave (sound or electrical) increases by a factor of n, this increase is 20*log_10(n) decibels.

Links

Crossrefs

Cf. A004220.

Programs

  • Mathematica
    Round[20 Log10[Range[60]]]
Showing 1-3 of 3 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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