11576...21111 (100-digits)

This number is a prime.

                                            1157688286 0704151325 4808305363
6817796488 7705174882 2488996153 1340177081 9802814995 1685814839 6728321111

The largest prime less than a googol with the form (2^n)*(10^6) + (2^n)*(10^5) + (2^n)*(10^4) + 1111, case n=309. [Barnes]