10538...57611 (253-digits)

This number is a prime.

                             105 3849511794 2582767057 3500250251 7640145448
6191538725 5824843476 7139119722 6520659192 3043098983 3282214685 6694388309
5567130915 8605373213 9798216767 3508163568 3474450942 3986810178 2955122025
2528654878 0762872873 7367091068 3168968505 8322024234 7703752716 4097157611

The smallest prime number in the sequence 1, 22, 203, 1071, ... . [Sariyar]