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A116899
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Numbers k such that (k concatenated k times) + 1 = A000461(k) + 1 is a prime number.
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0
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OFFSET
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1,2
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COMMENTS
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The (probable) prime corresponding to a(4)=3022, i.e., 3022302230...3023 has 12088 digits. Next term is greater than 5000.
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LINKS
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Primeform: User group for PFGW and PrimeForm programs. [There is insufficient information to determine which posting to the forum was intended. Probably not worth pursuing. - N. J. A. Sloane, Nov 10 2019]
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EXAMPLE
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1, 2 and 6 are terms since 1+1, 22+1 and 666666+1 are prime numbers.
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CROSSREFS
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KEYWORD
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base,hard,more,nonn
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AUTHOR
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STATUS
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approved
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