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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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a(15) > 300000. - Eric W. Weisstein (according to Mark Rodenkirch as of Dec 13 2015)
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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Table of n, a(n) for n=1..14.
Mark Rodenkirch (a.k.a. "rogue"), Copeland-Erdos Constant Primes, MersenneForum.org, June 2016.
Eric Weisstein's World of Mathematics, Copeland-Erdős Constant Digits
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CROSSREFS
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Cf. A227529 (primes corresponding to a(n) digits of the Copeland-Erdős constant), A019518, A069151.
Cf. also A033308 (Decimal expansion of Copeland-Erdős constant: concatenate primes).
Sequence in context: A038093 A057284 A156463 * A218129 A156519 A215795
Adjacent sequences: A227527 A227528 A227529 * A227531 A227532 A227533
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KEYWORD
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nonn,hard,base
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AUTHOR
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Eric W. Weisstein, Jul 14 2013
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EXTENSIONS
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a(12) = 68433 from Eric W. Weisstein, Aug 17 2013
a(13) = 97855 from Eric W. Weisstein, Oct 24 2015
a(14) = 292447 from Eric W. Weisstein, Dec 17 2015
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STATUS
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approved
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