79718...01797 (30-digits)

This number is a prime.

                                            7971811917 8719175719 1787101797

The largest 3-digits-at-a-time left-cut prime formed by linking 3-digit palindromic primes: 797181191787191757191787101797, 181191787191757191787101797, 191787191757191787101797, 787191757191787101797, 191757191787101797, 757191787101797, 191787101797, 787101797, 101797, 797. [Rivera]