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Possible Duplicate:
Distinct numbers in multiplication table

When I was little we learnt times tables up to 12 X 12 = 144. These involved 59 DIFFERENT answers. How many different answers would there be if I learnt my times tables up to 20 X 20, or n X n?

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See this question mathoverflow.net/questions/31663/… – Tony Huynh Jul 22 2010 at 0:13
We just had this question here not long ago. mathoverflow.net/questions/31663/… – Gerry Myerson Jul 22 2010 at 0:14
Apologies. I'm new here and I didn't spot it. – Gmackematix Jul 22 2010 at 0:28

closed as exact duplicate by Qiaochu Yuan, S. Carnahan♦ Jul 22 2010 at 0:17

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