A227530 -id:A227530 - cp's OEIS frontend

A227529 Copeland-Erdős constant primes (concatenation of entries (digits) of A033308 is prime).

2, 23, 2357, 23571113171

Offset: 1

Eric W. Weisstein, Jul 14 2013

Primes obtained by taking consecutive decimal digits (starting with the first) of the Copeland-Erdős constant.
The next terms are too big to display: a(5) = 235711131...6917017097 (353 digits), a(6) = 235711131...1701709719 (355 digits), ...
See A227530 for an equivalent but more compact way of listing the terms, namely, by giving the number of digits of the constant A033308 that must be taken to get a prime. - M. F. Hasler, Apr 24 2017

Eric W. Weisstein, Table of n, a(n) for n = 1..7
Hans Havermann and Eric W. Weisstein (first 11 terms), Table of n, a(n) for n = 1..14
Eric Weisstein's World of Mathematics, Copeland-Erdős Constant

Cf. A227530 (number of decimal digits in the n-th Copeland-Erdős prime).
Cf. A019518, A069151.
Cf. A033308 (Decimal expansion of Copeland-Erdős constant: concatenate primes).

A263959 Number of decimal digits in A069151(n).

Original entry on oeis.org

1, 2, 4, 355, 499, 1171, 1543, 5719

Offset: 1

Eric W. Weisstein, Oct 30 2015

Subset of A227530 (Copeland-Erdős constant primes) corresponding to concatenation of a full (non-truncated) final prime.

a(9) > 459970. - Eric W. Weisstein (according to Mark Rodenkirch as of Nov 21 2015)

Eric Weisstein's World of Mathematics, Consecutive Number Sequences
Eric Weisstein's World of Mathematics, Integer Sequence Primes
Eric Weisstein's World of Mathematics, Smarandache-Wellin Prime

Cf. A019518, A046035, A069151.
Cf. A227529 (Copeland-Erdős constant primes).
Cf. A227530 (decimal digits in n-th Copeland-Erdős constant prime).

Cases[FromDigits /@ Rest[FoldList[Join, {}, IntegerDigits[Prime[Range[10^3]]]]], p_?PrimeQ :> IntegerLength[p]]

p=""; for(n=1, 1e4, p=concat(p, prime(n)); if(ispseudoprime( eval(p)), print1(#Str(p)", "))) \\ Altug Alkan, Oct 30 2015

cp's OEIS Frontend

A227529 Copeland-Erdős constant primes (concatenation of entries (digits) of A033308 is prime).

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