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A171514
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Numbers k such that 1 + 8*10^k + 100^k is prime.
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0
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1, 3, 6, 9, 13, 17, 29, 63, 90, 531, 14286, 30617, 37815
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OFFSET
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1,2
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COMMENTS
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No more terms up to k = 7500.
14286, 30617, and 37815, found by Daniel Heuer in 2001-2002, are also terms; see Caldwell link. - Jeppe Stig Nielsen, Jan 30 2022
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LINKS
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MATHEMATICA
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Select[Range[1000], PrimeQ[1 + 8 10^# + 100^# ] &] (* Vincenzo Librandi, Apr 26 2014 *)
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PROG
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CROSSREFS
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KEYWORD
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more,hard,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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