10000...99999 (85-digits)

This number is a prime.

10000 0000000000
0000000000 0000000000 0000000099 9999999999 9999999999 9999999999 9999999999

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The largest prime less than a googol of form 10^(2k)+ 10^k-1, (k=42). [Loungrides]

Submitted: 2019-04-19 13:36:16; Last Modified: 2019-04-19 13:50:31.