OFFSET
1,2
LINKS
Don Reble, Table of n, a(n) for n=1..787
Dean Hickerson, Proof that a(15) = 0
Number Theory Web, Solving x^2-Dy^2=N
J. P. Robertson, Solving the Generalized Pell Equation
EXAMPLE
a(3) = 263 because (5^2+263^2)/2-1 = 186^2.
a(4) = 59 because (7^2+59^2)/2-1 = 42^2.
a(5) = 23 because (11^2+23^2)/2-1 = 18^2.
CROSSREFS
KEYWORD
nonn
AUTHOR
Nick Hobson, May 14 2007
STATUS
approved