37311...73173 (131-digits)

This number is a prime.

         3 7311278191 1310715242 8721474836 4723058430 0921369395 1618970019
6426901374 4956211123 0584300921 3693951214 7483647524 2871310718 1911273173

Concatenation of the first ten Mersenne primes (from 3 to 618970019642690137449562111 and down to 3 again) is the smallest such prime greater than a googol. [Bajpai]