OFFSET
0,3
LINKS
Snehal Shekatkar, On the sum of the r'th roots of first n natural numbers, arXiv:1204.0877 [math.NT], 2012-2013.
EXAMPLE
a(6) = 8 because 1^(1/3) + 2^(1/3) + 3^(1/3) + 4^(1/3) + 5^(1/3) + 6^(1/3) = 8.81667... .
MATHEMATICA
a[n_] := Floor[ HarmonicNumber[n, -1/3]]; Array[ a, 66, 0]
PROG
(PARI) a(n) = floor(sum(k=0, n, k^(1/3))); \\ Michel Marcus, Mar 02 2022
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Robert G. Wilson v, Mar 02 2022
STATUS
approved