OFFSET
1,2
COMMENTS
A subsequence of A000217, the triangular numbers.
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..5000
FORMULA
MATHEMATICA
f[n_] = Floor[n^(5/2)]*Floor[n^(5/2)+1]/2; Table[f[n], {n, 1, 80}]
(#(#+1))/2&/@Floor[Range[40]^(5/2)] (* Harvey P. Dale, Feb 27 2024 *)
PROG
(PARI) for(n=1, 50, print1(floor(n^(5/2))*floor(1 + n^(5/2))/2, ", ")) \\ G. C. Greubel, Jul 07 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 30 2011
STATUS
approved