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A227530
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Integer lengths of the n-th Copeland-Erdős prime (concatenation of the first n entries (digits) of A033308 is prime).
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2
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1, 2, 4, 11, 353, 355, 499, 1171, 1543, 5719, 11048, 68433, 97855, 292447
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OFFSET
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1,2
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COMMENTS
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The larger of these are probable primes.
a(15) > 5*10^5 according to Mark Rodenkirch, June 2016. - M. F. Hasler, Apr 24 2017
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LINKS
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CROSSREFS
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Cf. also A033308 (Decimal expansion of Copeland-Erdős constant: concatenate primes).
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KEYWORD
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nonn,hard,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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