Chen primes for which the product of the digits is also a Chen prime.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =13a(5) =17a(6) =31a(7) =71a(8) =113a(9) =131a(10) =211a(11) =311a(12) =1117a(13) =1151a(14) =1511a(15) =2111a(16) =11117a(17) =11171a(18) =131111a(19) =311111a(20) =511111a(21) =1111151a(22) =1111211a(23) =1111711a(24) =1117111a(25) =11111117a(26) =11111171a(27) =71111111