11854...00001 (33-digits)

This number is a prime.

118 5410078136 3342418076 1600000001

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The product of first 20 triangular numbers (1 through 210) plus 1 is the largest prime number of this type less than a googol. [Gupta]

Submitted: 2020-08-04 12:51:20; Last Modified: 2023-10-07 18:47:53.