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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
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1,1
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LINKS
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EXAMPLE
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11, 1199999, 1199999111111111, ... are all prime.
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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The next term has more than 800 1's and is too large to include.
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STATUS
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approved
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