One might also consider as solutions
as the pseudo-Fibo series does contain 520 as its second term.
Also a=520, any b>520 contains 520 as its first term.
I understand this is not the intent of the problem but it seems a reasonable interpretation of 'generated' to me.
That's why I earlier suggested specifying a<b<520.
(Which only removes a=0, b=520 from Charlie's list.)
Posted by Jer
on 2014-04-15 00:06:58