A228824 Decimal expansion of 4*Pi/5.

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

Offset

1,1

Comments

With offset 2, decimal expansion of 8*Pi.

8*Pi is also the surface area of a sphere whose diameter equals the square root of 8, hence its radius equals the square root of 2. More generally x*Pi is also the surface area of a sphere whose diameter equals the square root of x. - Omar E. Pol, Dec 18 2013

Links

Table of n, a(n) for n=1..104.

Index entries for transcendental numbers

Example

4*Pi/5 = 2.5132741228718345907701147066236023073577...
8*Pi = 25.132741228718345907701147066236023073577...

Mathematica

RealDigits[(4 Pi)/5, 10, 120][[1]] (* Harvey P. Dale, Aug 24 2017 *)

Prog

(PARI) .8*Pi \\ Charles R Greathouse IV, Oct 01 2022

Crossrefs

Cf. A002193, A228819.

Cf. A000796, A019692, A122952, A019694, A019669, A228719, A228721 (Pi through 7*Pi).

Sequence in context: A341923 A146097 A091953 * A011456 A233384 A186692

Adjacent sequences: A228821 A228822 A228823 * A228825 A228826 A228827

Keyword

nonn,cons

Author

Omar E. Pol, Oct 03 2013

Status

approved