Here is a square sequence of numbers.
392?
6 3
7 4
?817
What are the two question marks?
(In reply to
Solution by Richard Briscoe)
Nice... I'm sure you're right. Interestingly, I think the notion of "square" is what threw me and fwaff off... If it were phrased in a circle, I think it more likely that we might have seen that pattern. BTW, you should mark your comment with the 'Full Solution' icon...
Cheers!