Primes that contain digits 2 and 9 only.

Terms

a(0) =2a(1) =29a(2) =229a(3) =929a(4) =2999a(5) =9929a(6) =22229a(7) =99929a(8) =2222929a(9) =2229299a(10) =2292299a(11) =2299229a(12) =2922229a(13) =2992229a(14) =2992999a(15) =2999299a(16) =2999999a(17) =9222229a(18) =9922229a(19) =9929929a(20) =9929999a(21) =9999299a(22) =9999929a(23) =22229299a(24) =22292929a(25) =22299229a(26) =22929299a(27) =29229229a(28) =29229929