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A110782
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Copies of 1,3,7 and 9 cyclically such that every partial concatenation is a prime.
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12
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11, 3, 777, 999, 11, 33333333, 777777777777777777777, 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999, 1111111111111111111111111
(list;
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listen;
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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, 113, 113777, 113777999, ... 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 is 726 3's and is too large to include.
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STATUS
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approved
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