11854...00001 (33-digits)

This number is a prime.

                                        118 5410078136 3342418076 1600000001

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

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]