OFFSET
1,3
COMMENTS
Tribonacci numbers A000073 that are the sum of 2 nonnegative squares.
EXAMPLE
a(4) = 4 = 2^2 + 0^2.
a(8) = 274 = 7^2 + 15^2.
a(11) = 35890 = 13^2 + 189^2 = 49^2 + 183^2 = 103^2 + 159^2 = 117^2 + 149^2.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jonathan Vos Post, Sep 13 2012
STATUS
approved