At the risk of sounding ignorant...these numbers indicate...what?
Looks like a modified Pascal Triangle, but I've never seen it done quite like this. All are palindromic primes?
It's a pyramid (list) of palindromic primes supplied by G. L. Honaker, Jr.
From here:
http://primes.utm.edu/glossary/page.php?sort=PalindromicPrime
Enjoy! :):)