A018245 A self-generating sequence: there are a(n) (k+1)'s between successive k's, where k=4.

4, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 5, 4, 5, 5, 5, 5, 4

Offset

1,1

Links

Table of n, a(n) for n=1..105.

Maple

f:= proc(n, k) floor(n*(k+sqrt(k^2+4*k))/2)-floor((n-1)*(k+sqrt(k^2+4*k))/2) end:
seq(f(n, 4), n=1..105);

Crossrefs

Cf. A001468, A007538.

Sequence in context: A308740 A349990 A117768 * A264936 A103671 A144192

Adjacent sequences: A018242 A018243 A018244 * A018246 A018247 A018248

Keyword

nonn

Author

Jonas Wallgren

Status

approved