10000...09403 (100000-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

10^99999+309403 is the smallest 100000-digit probable prime. Found by Daniel Heuer in 2004 by sieving up to 2^33 and then checking ~8000 candidates with pfgw-linux. [Pfoertner]