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.

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A019701 Decimal expansion of 2*Pi/19.

Original entry on oeis.org

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

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Author

Keywords

Crossrefs

Equals twice A019686.

Programs

A387442 Decimal expansion of cos(Pi/19).

Original entry on oeis.org

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

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Author

R. J. Mathar, Aug 29 2025

Keywords

Examples

			0.98636130340272237360...
		

Crossrefs

Cf. A019686.

Formula

Equals sin(17*Pi/38).
Largest root of 512*x^9 -256*x^8 -1024*x^7 +448*x^6 +672*x^5 -240*x^4 -160*x^3 +40*x^2 +10*x -1 =0.
Showing 1-2 of 2 results.