

A121267


Number of decimal digits in A047777(n).


3



1, 5, 1, 3, 1, 2, 1, 4, 3057, 2, 3, 14650, 4, 2, 46, 4
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OFFSET

1,2


COMMENTS

Not equal to the first differences of A053013 (which is based on a different variant of A047777).
"A new visitor to an old problem! Jens Kruse Andersen confirmed the primality of Nash's 3057digit prime using PRIMO."  Carlos Rivera, Sep 2002.


LINKS

Table of n, a(n) for n=1..16.
Carlos Rivera, Problem 18. Pi as a concatenation of the smallest contiguous different primes, The Prime Puzzles & Problems Connection.


PROG

(PARI) default(realprecision, 5000); c=Pi/10; u=[]; for(k=1, 9e9, ispseudoprime(c\.1^k) & !setsearch(u, c\.1^k) & (u=setunion(u, Set(c\.1^k))) & !print1(k, ", ") & k=0*c=frac(c*10^k)) \\  M. F. Hasler, Sep 15 2013


CROSSREFS

Cf. A047777, A053013.
Sequence in context: A134568 A198798 A229181 * A111740 A327921 A155059
Adjacent sequences: A121264 A121265 A121266 * A121268 A121269 A121270


KEYWORD

nonn,base,more


AUTHOR

Robert G. Wilson v, Aug 23 2006


EXTENSIONS

The old values a(10) onwards were incorrect, as discovered by M. F. Hasler, Aug 31 2013. The old values, the bfile and the Mathematica program have been deleted.  N. J. A. Sloane, Sep 01 2013


STATUS

approved



