A025215 - OEIS

A025215

a(n) = [ Sum of squares of 1 + 1/2 + ... + 1/k ], k = 1,2,...,n.

1, 3, 6, 10, 16, 22, 28, 36, 44, 52, 61, 71, 81, 92, 103, 114, 126, 138, 151, 164, 177, 191, 205, 219, 233, 248, 263, 279, 295, 311, 327, 343, 360, 377, 394, 412, 429, 447, 465, 483, 502, 521, 540, 559, 578, 598, 617, 637, 657, 677, 698, 718, 739, 760, 781, 803, 824, 846, 867

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

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..59.

PROG

(PARI) a(n) = floor(sum(k=1, n, sum(j=1, k, 1/j)^2)) \\ Michel Marcus, Mar 24 2013

CROSSREFS

Sequence in context: A260708 A310083 A310084 * A327141 A283503 A294481

Adjacent sequences: A025212 A025213 A025214 * A025216 A025217 A025218

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved