OFFSET
1,1
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..52
FORMULA
From Benoit Cloitre, Nov 28 2002: (Start)
a(2n) = 2*3^n-1.
Conjecture: if n>1 sqrt(3^(2n+1)) < a(2n+1) < sqrt((2n+1)*3^(2n+1)). (End)
MATHEMATICA
Table[Apply[Plus, Last[ContinuedFraction[Sqrt[ -1+3^u]]]], {u, 1, 25}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Nov 13 2002
EXTENSIONS
a(26)-a(36) from Chai Wah Wu, Sep 18 2021
STATUS
approved