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'Latin Numbers' printed from http://nrich.maths.org/
Here is an example of a 4 by 4 Latin square:
Can you see what is going on?
In a Latin Square each symbol or colour occurs exactly once in each row and exactly once in each column.
Can you find the six digit number N?
In the grid below, N is a 6 digit number with a very special property:
if you double the number and write it in the second row,
treble the number and write it in the third row,
and so on...
you end up with a Latin Square!
If you're finding it difficult to get started, click below to see a diagram showing one possible order in which you can work out each value.
Work out the number in the pale blue cell first.
Then the numbers in the column marked "2nd", then "3rd" and so on...
There is some more advice in the Getting Started