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 1-2 of 2 results.

A019884 Decimal expansion of sine of 75 degrees.

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane

Keywords

Comments

Also the real part of i^(1/6). - Stanislav Sykora, Apr 25 2012
Length of one side of the new Type 15 Convex Pentagon. - Michel Marcus, Aug 04 2015

Examples

			0.96592582628906828674974319972889736763390483900840455040234307631042...

Links

Crossrefs

Cf. A120683.

Programs

Formula

Equals cos(Pi/12) = [1+sqrt(3)]/[2*sqrt(2)] = A090388 * A020765. - R. J. Mathar, Jun 18 2006
Equals A019859 * A019874 + A019834 * A019849 = A019881 * A019896 + A019812 * A019827 . - R. J. Mathar, Jan 27 2021
Equals 1/(sqrt(6) - sqrt(2)) = 1/A120683. - Amiram Eldar, Aug 04 2022
Largest of the 4 real-valued roots of 16*x^4 -16*x^2 +1=0. - R. J. Mathar, Aug 29 2025
4*this^3 -3*this = A010503. - R. J. Mathar, Aug 29 2025
Equals 2F1(-1/8,1/8 ;1/2;3/4) = 2F1(-1/6,1/6;1/2;1/2). - R. J. Mathar, Aug 31 2025

A019859 Decimal expansion of sine of 50 degrees.

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane

Keywords

Comments

A cubic number with denominator 2 and minimal polynomial 8x^3 - 6x + 1. - Charles R Greathouse IV, Nov 05 2017
The roots of the polynomial 8x^3 - 6x + 1 can be constructed using the intersection of the circle defined by x^(2) + y^(2) - 0.125x + 0.25y = 0.75 and the hyperbola defined by -8xy+y=-1. The circle and the hyperbola intersect at (0,-1) and 3 other points. 3 lines can be drawn by connecting the point (0,-1) to the other 3 points of intersection. The 3 lines intersect the x-axis at the locations of the roots. - Raul Prisacariu, Jul 29 2024

Examples

			0.76604444...

Links

Programs

Formula

Equals cos(2*Pi/9) = 2F1(5/6,1/6;1/2;3/4) / 2. - R. J. Mathar, Oct 27 2008
Equals 2*A019834*A019874. - R. J. Mathar, Jan 17 2021
Showing 1-2 of 2 results.

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

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