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A020460 Primes that contain digits 2 and 9 only. 7
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
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: A179025 A244599 A261268 * A178000 A036939 A342962
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified June 24 00:53 EDT 2024. Contains 373661 sequences. (Running on oeis4.)