Palindromic primes with digit sum 7.

Terms

a(0) =7a(1) =151a(2) =313a(3) =10501a(4) =11311a(5) =30103a(6) =1201021a(7) =3001003a(8) =100050001a(9) =100131001a(10) =101030101a(11) =110111011a(12) =111010111a(13) =10000500001