A018245 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

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

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; (with k=4)

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