193

This number is a prime.

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The largest number which can be written as ab + bc + ca in a unique way (0 < a < b < c to avoid trivial duplicates): 4*7 + 7*15 + 15*4 = 193. [Gudipati]

Divide a googol by 11222.11122, the 193^rd root of the result to get π close to 11 digits (3.14159265364). [Gudipati]