1062881

This number is a prime.

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The natural numbers can be arranged into a list of ratios, all of which are integers: (1+2)/3, (4+5+6+7+8+9+10+11)/12, (13+14+15+...+36+37+38)/39, (40+41+42+...+118+119)/120.... The thirteenth of these ratios is the prime 1062881. [Caldwell]