10019...91983 (153-digits)

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

                                                              100 1919831001
9418110019 4683100194 9171001949 3710019494 7100195079 1001950991 0019549910
0195099100 1950791001 9494710019 4937100194 9171001946 8310019418 1100191983

The smallest prime formed from the concatenation of n consecutive n-digit Honaker primes in the pattern: {a, b, c, d, e, f, g, h, i, h, g, f, e, d, c, b, a}, i.e., { 100191983, 100194181, 100194683, 100194917, 100194937, 100194947, 100195079, 100195099, 100195499, 100195099, 100195079, 100194947, 100194937, 100194917, 100194683, 100194181, 100191983}, (case n=9). [Bajpai]