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%I #18 Feb 13 2015 08:28:05
%S 52,276,25477
%N Integer lengths of Catalan-primes: numbers n such that the concatenation of the first n decimal digits of Catalan's constant is prime.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/CatalansConstantDigits.html">Catalan's Constant Digits</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ConstantPrimes.html">Constant Primes</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/IntegerSequencePrimes.html">Integer Sequence Primes</a>
%e C = 0.915965594177..., so a(1) = 52 (the 52-digit number 915965...6721 is the 1st prime in the digit string).
%Y Cf. A006752, A118329.
%K nonn,more,bref,base
%O 1,1
%A _Eric W. Weisstein_, Apr 24 2006
%E a(3) = 25477 from _Eric W. Weisstein_, May 05 2006
%E Edited by _Charles R Greathouse IV_, Apr 27 2010
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