A395992 Decimal expansion of 20612/6561.

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

Offset

1,1

Comments

In 1851, Parker claimed erroneously that Pi, the ratio of a circle's circumference to its diameter, was not a transcendental number, but the ratio of whole numbers 20612 and 6561.

Has period 729 starting from a(2). - Jianing Song, Jun 12 2026

Links

Table of n, a(n) for n=1..100.

John A. Parker, The Quadrature of the Circle, (1851). See p. 73.

Index entries for algebraic numbers, degree 1.

Index entries for linear recurrences with constant coefficients, order 729.

Example

3.141594269166285627190976985215668343240359701...

Mathematica

RealDigits[20612/6561, 10, 100][[1]]

Crossrefs

Cf. A000796, A068079, A210622, A354617, A374829, A375820, A380152.

Sequence in context: A374322 A068079 A152042 * A392358 A057466 A187079

Adjacent sequences: A395989 A395990 A395991 * A395993 A395994 A395995

Keyword

nonn,cons,easy

Author

Stefano Spezia, Jun 12 2026

Status

approved