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a(1)=0, and a(n+1) is the position of first occurrence of a(n) in the decimal expansion of 1/Pi.
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%I #12 Jul 12 2015 19:48:48

%S 0,5,19,41,717,925,358,1004,5044,6981,2520,7559,139,694,919,40,36,126,

%T 663,1745,3950,12447,18530,22257,82998,27887,5940,1387,3601,2344,2795,

%U 2422,49157,6577,5816,10987,36519,334412,153716,1055197,11437580

%N a(1)=0, and a(n+1) is the position of first occurrence of a(n) in the decimal expansion of 1/Pi.

%C The equivalent sequence for Zeta(3) repeated after very few terms. When, if ever, does this sequence start to repeat?

%e 1/Pi = 0.31830988618379067153...

%e a(1)=0; a(2)=5 because the 5th decimal digit after the "0." is 0; a(3)=19 because the 19th digit is 5, etc.

%Y Cf. A098266 (for e version), A097614 (for Pi version), A098289 (for log(2) version), A098290 (for Zeta(3) version), A049541 for digits of 1/Pi.

%K nonn,base

%O 1,2

%A Mark Hudson (mrmarkhudson(AT)hotmail.com), Sep 02 2004

%E a(38)-a(39) from _Nathaniel Johnston_, Apr 30 2011

%E a(40) and a(41) from _D. S. McNeil_, Aug 27 2011