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A110780
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Copies of 1 and 9 alternately such that every partial concatenation is a prime.
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14
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OFFSET
| 1,1
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EXAMPLE
| 11,1199999,1199999111111111,... are all prime.
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CROSSREFS
| Cf. A110774, A110775, A110776, A110777, A110778, A110781.
Sequence in context: A102367 A055322 A165934 * A087395 A199169 A145571
Adjacent sequences: A110777 A110778 A110779 * A110781 A110782 A110783
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 12 2005
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EXTENSIONS
| More terms from Joshua Zucker, Jan 11 2006
The next term has more than 800 1's and is too large to include.
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