Search: id:A005042
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%I A005042 M3129
%S A005042 3,31,314159,31415926535897932384626433832795028841
%N A005042 Primes formed by the initial digits of the decimal expansion of Pi.
%C A005042 The next term consists of the first 16208 digits of Pi and is too large 
               to show here (see A060421). Ed T. Prothro found this probable prime 
               in 2001.
%C A005042 Michael Kleber (michael.kleber(AT)gmail.com) observes that a naive probabilistic 
               argument suggests that the sequence is infinite. Jun 23 2004.
%D A005042 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A005042 M. Gardner, personal communication.
%H A005042 <a href="Sindx_Ph.html#Pi314">Index entries for sequences related to 
               the number Pi</a>
%H A005042 Ed T. Prothro, <a href="http://ourworld.compuserve.com/homepages/prothro/
               how.htm">How I Found the Next Pi Prime</a>
%H A005042 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Pi-Prime.html">Pi-Prime</a>
%p A005042 Digits := 130; n0 := evalf(Pi); for i from 1 to 120 do t1 := trunc(10^i*n0); 
               if isprime(t1) then print(t1); fi; od:
%t A005042 a = {}; Do[k = Floor[Pi 10^n]; If[PrimeQ[k], AppendTo[a, k]], {n, 0, 
               160}]; a - Artur Jasinski (grafix(AT)csl.pl), Mar 26 2008
%Y A005042 See A060421 for futher terms.
%Y A005042 Sequence in context: A002707 A144964 A118913 this_sequence A136582 A119937 
               A114257
%Y A005042 Adjacent sequences: A005039 A005040 A005041 this_sequence A005043 A005044 
               A005045
%K A005042 nonn,base
%O A005042 1,1
%A A005042 N. J. A. Sloane (njas(AT)research.att.com).

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