a(0) = 2; for n > 0, a(n) is the smallest palindromic prime containing exactly n more digits on each end than a(n-1), with a(n-1) as the central substring.

A375956

a(0) = 2; for n > 0, a(n) is the smallest palindromic prime containing exactly n more digits on each end than a(n-1), with a(n-1) as the central substring.