A387453 Decimal expansion of cos(Pi/29).

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

Offset

0,1

Links

Paolo Xausa, Table of n, a(n) for n = 0..10000

R. J. Mathar, Reduction formulas of the cosine of integer fractions of pi, (2008) vixra:2210.0026.

Index entries for algebraic numbers, degree 14

Formula

Equals sin(27*Pi/58).

Largest of the 14 real-valued roots of 16384*x^14 -8192*x^13 -53248*x^12 +24576*x^11 +67584*x^10 -28160*x^9 -42240*x^8 +15360*x^7 +13440*x^6 -4032*x^5 -2016*x^4 +448*x^3 +112*x^2 -14*x -1 =0.

Example

0.99413795715435960895530271587955156685455961848139...

Mathematica

First[RealDigits[Cos[Pi/29], 10, 100]] (* Paolo Xausa, Nov 17 2025 *)

Prog

(PARI) cos(Pi/29) \\ Charles R Greathouse IV, Nov 17 2025

Crossrefs

Sequence in context: A118739 A192031 A393892 * A283749 A249023 A336044

Adjacent sequences: A387450 A387451 A387452 * A387454 A387455 A387456

Keyword

nonn,cons,easy

Author

R. J. Mathar, Aug 29 2025

Status

approved