A010781 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A010781

Decimal expansion of 19th root of 2.

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

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..5000 (a(5000) corrected by Sean A. Irvine)

FORMULA

Equals Product_{k>=0} (1 + (-1)^k/(19*k + 18)). - Amiram Eldar, Aug 01 2020

MATHEMATICA

RealDigits[N[2^(1/19), 100]][[1]] (* Vincenzo Librandi, Apr 03 2013 *)

PROG

(PARI) sqrtn(2, 19) \\ Charles R Greathouse IV, Apr 15 2014

CROSSREFS