A239297 Floor of first differences of Pi*10^n.

3, 28, 282, 2827, 28274, 282743, 2827433, 28274333, 282743338, 2827433388, 28274333882, 282743338823, 2827433388230, 28274333882308, 282743338823081, 2827433388230813, 28274333882308139, 282743338823081391, 2827433388230813914

Offset

0,1

Comments

For n>0, a(n) = decimal expansion of 9*Pi truncated to n-1 places.

This sequence is not the same as the first differences of A011545: 3, 28, 283, 2827, 28274, 282744, 2827433, 28274334, 282743339, 2827433388, ...

Links

Table of n, a(n) for n=0..18.

Formula

a(0)=3, a(n)=floor(Pi*10^n-Pi*10^(n-1)) for n>0.

Example

a(2)=floor(Pi*10^2-Pi*10^1) = 282.

Mathematica

Join[{3}, Differences[Pi*10^Range[0, 20]]//Floor] (* Harvey P. Dale, Oct 19 2018 *)

Prog

(PARI) a(n) = if (n==0, 3, floor(Pi*10^n-Pi*10^(n-1))); \\ Michel Marcus, Mar 18 2014

Crossrefs

Cf. A011545.

Sequence in context: A198887 A026114 A181069 * A287884 A250890 A199754

Adjacent sequences: A239294 A239295 A239296 * A239298 A239299 A239300

Keyword

nonn

Author

Jeremy Gardiner, Mar 14 2014

Status

approved