14001...10041 (1073-digits)

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

The bottom row of a palindromic prime pyramid (starting with 2) of step size 4 and height 135, where each palindromic prime p is the smallest p that contains p in the row above. It is the p associated with a(4) in the following sequence: 3, 11, 26, 135, 828, ... . [Gupta]