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

1,1

Links

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

Mathematica

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

Prog

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

Crossrefs

Sequence in context: A386048 A385785 A261268 * A178000 A036939 A342962

Adjacent sequences: A020457 A020458 A020459 * A020461 A020462 A020463

Keyword

nonn,base

Author

David W. Wilson

Status

approved