91521...55159 (73-digits)

This number is a prime.

915
2125333539 4951555765 6977858791 9395111115 1191211231 2913314114 3145155159

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The largest prime less than a googol formed from the concatenation of the first n odd semiprimes (case n=31). [Gupta]

Submitted: 2019-06-26 00:45:18; Last Modified: 2019-06-26 00:50:44.