1,1

Continued fraction expansion of (3+sqrt(15))/3 is A010693.

a(n) = A020817(n-1) for n > 1; a(1) = 2.

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

(3+sqrt(15))/3 = 2.29099444873580562839...

RealDigits[(3+Sqrt[15])/3, 10, 120][[1]] (* Harvey P. Dale, May 20 2013 *)

Cf. A010472 (decimal expansion of sqrt(15)), A176016 (decimal expansion of (3+sqrt(15))/6), A010693 (repeat 2, 3), A020817 (decimal expansion of 1/sqrt(60)).

Sequence in context: A180370 A326939 A011148 * A048650 A125313 A199058

Adjacent sequences: A176017 A176018 A176019 * A176021 A176022 A176023

cons,nonn

Klaus Brockhaus, Apr 06 2010

approved