

A196686


Number of odd digits of Pi minus number of even digits.


2



1, 2, 1, 2, 3, 4, 3, 2, 3, 4, 5, 4, 5, 6, 7, 8, 7, 8, 7, 6, 5, 4, 3, 2, 3, 4, 3, 4, 3, 4, 5, 6, 5, 4, 3, 2, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, 10, 11, 12, 11, 12, 11, 10, 9, 10, 11, 10, 11, 10, 9, 10, 11, 10, 11, 10, 11, 10, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 2, 3, 2, 1, 0, 1, 2, 1, 2, 3, 4, 3, 2, 3, 4, 3, 2
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


COMMENTS

Cumulative sum of A030657 with zeros replaced by "1".


LINKS



EXAMPLE

Among first 10 digits of Pi, {3,1,4,1,5,9,2,6,5,3}, there are 7 odd and 3 even, hence a(10)=73=4.


MATHEMATICA

rd=RealDigits[N[Pi, 10004]][[1]]; a=0; s=Reap[Do[a=a+2Mod[rd[[n]], 2]1; Sow[{n, a}], {n, 10004}]][[2, 1]] (* this gives bfile *) (* Zak Seidov, Oct 05 2011 *)


CROSSREFS



KEYWORD

sign,base


AUTHOR



EXTENSIONS



STATUS

approved



