login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A194286 Triangular array: g(n,k)=number of fractional parts (i*sqrt(2)) in interval [(k-1)/n, k/n], for 1<=i<=2n, 1<=k<=n. 2

%I #5 Mar 30 2012 18:57:42

%S 2,2,2,2,3,1,2,3,1,2,2,2,2,2,2,2,2,2,2,2,2,2,1,3,2,1,3,2,1,3,1,3,1,3,

%T 2,2,2,2,2,2,2,3,1,2,2,2,1,3,2,3,1,2,2,3,1,2,2,2,2,2,2,2,2,2,3,1,2,2,

%U 2,2,2,2,2,2,2,2,2,2,2,2,1,2,2,3,2,1,2,2,3,2,2,2,2,2,2,2,2,2,2

%N Triangular array: g(n,k)=number of fractional parts (i*sqrt(2)) in interval [(k-1)/n, k/n], for 1<=i<=2n, 1<=k<=n.

%C See A194285.

%e First eight rows:

%e 2

%e 2..2

%e 2..3..1

%e 2..3..1..2

%e 2..2..2..2..2

%e 2..2..2..2..2..2

%e 2..1..3..2..1..3..2

%e 1..3..1..3..1..3..2..2

%t r = Sqrt[2];

%t f[n_, k_, i_] := If[(k - 1)/n <= FractionalPart[i*r] < k/n, 1, 0]

%t g[n_, k_] := Sum[f[n, k, i], {i, 1, 2 n}]

%t TableForm[Table[g[n, k], {n, 1, 14}, {k, 1, n}]]

%t Flatten[%] (* A194286 *)

%Y Cf. A194285.

%K nonn,tabl

%O 1,1

%A _Clark Kimberling_, Aug 21 2011

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 19 09:23 EDT 2024. Contains 371782 sequences. (Running on oeis4.)