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 A291943 a(0)=0; for n>0, a(n) = (2n)-th digit after the decimal point in the decimal expansion of 1/(2n+1). 1
 0, 3, 0, 7, 1, 9, 3, 6, 7, 1, 4, 3, 0, 3, 1, 9, 3, 5, 7, 2, 9, 3, 2, 7, 8, 1, 3, 1, 1, 1, 9, 1, 3, 7, 1, 9, 3, 3, 9, 1, 7, 3, 7, 1, 1, 9, 1, 5, 7, 1, 9, 3, 0, 7, 1, 0, 3, 6, 0, 0, 8, 0, 0, 7, 0, 9, 8, 0, 7, 1, 0, 9, 8, 4, 1, 9, 4, 4, 7, 0, 6, 3, 0, 7, 3, 5, 3, 4, 0, 1, 9, 0, 4, 5, 0, 9, 3, 0, 7, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 REFERENCES John H. Conway & Richard K. Guy,  The Book of Numbers; Springer 1996. LINKS Robert Israel, Table of n, a(n) for n = 0..10000 EXAMPLE a(3)=7 since we want the sixth decimal digit of 1/7. MAPLE f:= proc(n) floor(10^(2*n)/(2*n+1)) mod 10 end proc: f(0):= 0: map(f, [\$0..100]); # Robert Israel, Oct 31 2017 MATHEMATICA f[n_] := Mod[Floor[10^(2n)/(2n +1)], 10]; f[0] = 0; Array[f, 105, 0] (* Robert G. Wilson v, Oct 31 2017 *) CROSSREFS Cf. A002371, A003060, A006883, A036275, A051626, A061480, A114205, A121090, A270392. Sequence in context: A011080 A021769 A200119 * A203622 A201571 A010600 Adjacent sequences:  A291940 A291941 A291942 * A291944 A291945 A291946 KEYWORD nonn,base AUTHOR Marco Matosic, Sep 06 2017 EXTENSIONS Edited by N. J. A. Sloane, Oct 30 2017 a(82) corrected by Robert Israel, Oct 31 2017 STATUS approved

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Last modified June 6 12:40 EDT 2020. Contains 334827 sequences. (Running on oeis4.)