OFFSET
1,1
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..10000
Eric Weisstein's World of Mathematics, Periodic Continued Fraction
EXAMPLE
a(2) = 6, sqrt(6) = 2 + 1/(2 + 1/(4 + 1/(2 + 1/(4 + 1/...)))), period 2: [2, 4].
PROG
(Python)
from sympy import continued_fraction_periodic
def A288185(n):
d = 2
while True:
s = continued_fraction_periodic(0, 1, d)[-1]
if isinstance(s, list) and len(s) == n:
return d
d += 2 # Chai Wah Wu, Jun 08 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Jun 06 2017
STATUS
approved