Primes whose digits are prime and in nonincreasing order.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =53a(5) =73a(6) =733a(7) =773a(8) =5333a(9) =7333a(10) =7753a(11) =55333a(12) =75533a(13) =75553a(14) =77773a(15) =733333a(16) =755333a(17) =775553a(18) =7553333a(19) =7555333a(20) =7775533a(21) =7777753a(22) =55555333a(23) =55555553a(24) =77755553a(25) =555553333a(26) =755555533a(27) =773333333a(28) =777555553a(29) =777773333