Primes prime(n) such that n and prime(n) have only prime digits.

Terms

a(0) =3a(1) =5a(2) =257a(3) =2237a(4) =2377a(5) =2557a(6) =5557a(7) =33353a(8) =33377a(9) =73237a(10) =252233a(11) =252253a(12) =253573a(13) =3533377a(14) =3533533a(15) =3555557a(16) =3577333a(17) =5375327a(18) =5375533a(19) =7725733a(20) =7737557a(21) =7777337a(22) =37237523a(23) =37237573a(24) =37237723a(25) =37273237a(26) =37273337a(27) =55775227a(28) =527522777a(29) =527523223