

A118328


Integer lengths of Catalanprimes: numbers n such that the concatenation of the first n decimal digits of Catalan's constant is prime.


2




OFFSET

1,1


LINKS

Table of n, a(n) for n=1..3.
Eric Weisstein's World of Mathematics, Catalan's Constant Digits
Eric Weisstein's World of Mathematics, Constant Primes
Eric Weisstein's World of Mathematics, Integer Sequence Primes


EXAMPLE

C = 0.915965594177..., so a(1) = 52 (the 52digit number 915965...6721 is the 1st prime in the digit string).


CROSSREFS

Cf. A006752, A118329.
Sequence in context: A252335 A230533 A235654 * A079414 A270769 A281396
Adjacent sequences: A118325 A118326 A118327 * A118329 A118330 A118331


KEYWORD

nonn,more,bref,base


AUTHOR

Eric W. Weisstein, Apr 24 2006


EXTENSIONS

a(3) = 25477 from Eric W. Weisstein, May 05 2006
Edited by Charles R Greathouse IV, Apr 27 2010


STATUS

approved



