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A171227
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Numbers k such that 9 + 10^k + 9*100^k is prime.
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0
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0, 1, 4, 17, 26, 28, 47, 70, 91, 1129, 4334, 12347
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OFFSET
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1,3
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COMMENTS
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No more terms up to k = 4100.
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LINKS
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EXAMPLE
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19, 919, 900010009 are prime so that 0, 1 and 4 are terms.
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PROG
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CROSSREFS
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KEYWORD
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more,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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