91521...55159 (73-digits)

This number is a prime.

                                                                         915
2125333539 4951555765 6977858791 9395111115 1191211231 2913314114 3145155159

Just showing those entries submitted by 'Gupta': (Click here to show all)

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