%I A004601
%S A004601 1,1,0,0,1,0,0,1,0,0,0,0,1,1,1,1,1,1,0,1,1,0,1,0,1,0,1,0,0,0,1,0,0,0,1,
%T A004601 0,0,0,0,1,0,1,1,0,1,0,0,0,1,1,0,0,0,0,1,0,0,0,1,1,0,1,0,0,1,1,0,0,0,1,
%U A004601 0,0,1,1,0,0,0,1,1,0,0,1,1,0,0,0,1,0,1,0,0,0,1,0,1,1,1,0,0,0,0,0,0,0,1
%N A004601 Expansion of Pi in base 2.
%C A004601 The 10^k_th binary digit of Pi beginning with k=0: 0,0,0,1,1,0,1,1,0, 
               ..., . [From Robert G. Wilson v (rgwv(AT)rgwv.com), May 04 2009]
%C A004601 It appears to me that, if this is read as a decimal number, it is an 
               example of an irrational number that is not normal (no '2' for example, 
               and if it repeated or terminated, pi would too). [From Alvin H. Belt 
               (abelt3(AT)juno.com), Jun 19 2009]
%D A004601 J. P. Delahaye, Le Fascinant Nombre Pi, "100000 digits of pi in base 
               two", pp. 209-210; Pour la Science, Paris 1997.
%H A004601 A. Brouty, <a href="http://perso-info.enst-bretagne.fr/~brouty/Maths/
               PI/pi2.html">Les decimales de PI en base 2 jusqu'a 1 million</a>
%H A004601 Elias's Pi Page, <a href="http://www.befria.nu/elias/pi/">Binary representation 
               of pi with 32768 digits</a>
%H A004601 Steve Pagliarulo, <a href="http://home.istar.ca/~lyster/pistats/base2.txt">
               Stu's pi page</a>
%t A004601 RealDigits[Pi, 2, 75][[1]]
%Y A004601 Cf. A000796., A119017, A068425, A117721, A065987.
%Y A004601 Pi in various bases: A004601 to A004608, A000796, A068436 to A068440, 
               A062964. Cf. A007514.
%Y A004601 Sequence in context: A113429 A133100 A077606 this_sequence A114915 A074711 
               A004585
%Y A004601 Adjacent sequences: A004598 A004599 A004600 this_sequence A004602 A004603 
               A004604
%K A004601 nonn,base,cons
%O A004601 2,1
%A A004601 N. J. A. Sloane (njas(AT)research.att.com).