OFFSET
1,1
EXAMPLE
a(1) = T(644) = 644*(644+1)/2 = 207690 = 2*3*5*7*23*43.
a(2) = T(714) = 714*(714+1)/2 = 255255 = 3*5*7*11*13*17.
a(3) = T(740) = 740*(740+1)/2 = 274170 = 2*3*5*13*19*37.
MATHEMATICA
Select[Accumulate[Range[2000]], FactorInteger[#][[;; , 2]] == {1, 1, 1, 1, 1, 1} &] (* Amiram Eldar, May 02 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Massimo Kofler, May 02 2023
STATUS
approved