Primes with a prime number of digits, all of them prime, that add up to a prime.

Terms

a(0) =23a(1) =223a(2) =227a(3) =337a(4) =353a(5) =373a(6) =557a(7) =577a(8) =733a(9) =757a(10) =773a(11) =22573a(12) =23327a(13) =25237a(14) =25253a(15) =25523a(16) =27253a(17) =27527a(18) =32233a(19) =32237a(20) =32257a(21) =32323a(22) =32327a(23) =33223a(24) =33353a(25) =33377a(26) =33533a(27) =33773a(28) =35227a(29) =35353