13112...54321 (39-digits)

This number is a prime.

131121111 1019988776 6554433221 1987654321

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The only prime less than a googol formed by concatenating in descending order the first n palindromic numbers (case n=22). [Gupta]

Submitted: 2019-03-31 01:26:11; Last Modified: 2019-03-31 12:15:08.