1,2

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

(See the Mathematica code.)

a=5/2; b=-1/2;

F[n_]:=a*n^2+b*n;

R[n_]:=(n/a+((b-1)/(2a))^2)^(1/2);

G[n_]:=n-1+Ceiling[R[n]-(b-1)/(2a)];

Table[F[n], {n, 60}]

Table[G[n], {n, 100}]

Cf. A005476.

Sequence in context: A293727 A077528 A329254 * A138928 A116587 A057903

Adjacent sequences: A183293 A183294 A183295 * A183297 A183298 A183299

nonn

Clark Kimberling, Jan 03 2011

approved