A078259 a(n) = denominator(N), where N = 0.135..(2n-1) is the concatenation of the first n odd numbers after decimal point.
10, 100, 200, 10000, 100000, 10000000, 1000000000, 20000000000, 10000000000000, 1000000000000000, 100000000000000000, 10000000000000000000, 40000000000000000000, 100000000000000000000000, 10000000000000000000000000, 1000000000000000000000000000
Offset: 1
Programs
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Maple
a:= n-> (t-> denom(t/10^length(t)))(parse(cat(2*i-1$i=1..n))): seq(a(n), n=1..16); # Alois P. Heinz, Jun 25 2025
Extensions
Corrected and extended by Sascha Kurz, Jan 04 2003
a(4)-a(5) corrected and more terms from Sean A. Irvine, Jun 25 2025