Prime numbers with odd digits in descending order.

Terms

a(0) =3a(1) =5a(2) =7a(3) =11a(4) =31a(5) =53a(6) =71a(7) =73a(8) =97a(9) =311a(10) =331a(11) =733a(12) =751a(13) =773a(14) =911a(15) =953a(16) =971a(17) =977a(18) =991a(19) =997a(20) =3331a(21) =5333a(22) =5531a(23) =7331a(24) =7333a(25) =7753a(26) =9311a(27) =9511a(28) =9533a(29) =9551