Undulating alternating palindromic primes.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =101a(5) =181a(6) =383a(7) =727a(8) =787a(9) =929a(10) =10301a(11) =10501a(12) =14341a(13) =16361a(14) =16561a(15) =18181a(16) =30103a(17) =30703a(18) =32323a(19) =36563a(20) =38183a(21) =38783a(22) =70507a(23) =72727a(24) =74747a(25) =78787a(26) =90709a(27) =94949a(28) =96769a(29) =1074701