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A036939
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Smallest n-digit prime containing only digits 2 and 9, or 0 if no such prime exists.
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0
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2, 29, 229, 2999, 22229, 0, 2222929, 22229299, 222229229, 2222229299, 22222229299, 0, 2222222229229, 22222222222229, 222222222229229, 2222222222229299, 22222222222922299, 0, 2222222222222292929
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MATHEMATICA
| Join[{2}, Table[Min[Select[FromDigits/@(Join[#, {9}]&/@Tuples[{2, 9}, n]), IntegerLength[#]==n+1&&PrimeQ[#]&]], {n, 20}]]/.\[Infinity]->0 (* From Harvey P. Dale, Nov 08 2011 *)
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CROSSREFS
| Cf. A036229, A020460, A036312.
Sequence in context: A179025 A020460 A178000 * A124301 A077023 A101750
Adjacent sequences: A036936 A036937 A036938 * A036940 A036941 A036942
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Jan 04 1999.
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