A020460 Primes that contain digits 2 and 9 only.

2, 29, 229, 929, 2999, 9929, 22229, 99929, 2222929, 2229299, 2292299, 2299229, 2922229, 2992229, 2992999, 2999299, 2999999, 9222229, 9922229, 9929929, 9929999, 9999299, 9999929, 22229299, 22292929, 22299229, 22929299, 29229229, 29229929

Offset: 1

Author

David W. Wilson

Keywords

• nonn
• base

Links

• Jason Bard, Table of n, a(n) for n = 1..10000 (first 1000 terms from Vincenzo Librandi)

Programs

Magma

[p: p in PrimesUpTo(29229929) | Set(Intseq(p)) subset [2, 9]]; // Vincenzo Librandi, Jul 27 2012

Mathematica

Flatten[Table[Select[FromDigits/@Tuples[{2,9},n],PrimeQ],{n,8}]] (* Vincenzo Librandi, Jul 27 2012 *)