A018244 A self-generating sequence: there are a(n) (k+1)'s between successive k's, where k=3.

3, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4

Offset

1,1

Links

Table of n, a(n) for n=1..80.

Maple

k := 3; A018244 := proc(n) global k; floor(n*(k+sqrt(k^2+4*k))/2)-floor((n-1)*(k+sqrt(k^2+4*k))/2); end;

Crossrefs

Cf. A001468, A007538.

Sequence in context: A143490 A007485 A280356 * A113311 A255176 A288177

Adjacent sequences: A018241 A018242 A018243 * A018245 A018246 A018247

Keyword

nonn

Author

Jonas Wallgren

Status

approved