A362758 Triangular numbers which are products of six distinct primes.

207690, 255255, 274170, 303810, 304590, 323610, 370230, 391170, 426426, 487578, 649230, 650370, 744810, 763230, 856086, 951510, 1007490, 1186570, 1248990, 1352190, 1365378, 1376970, 1473186, 1512930, 1528626, 1567335, 1594005, 1655290, 1657110, 1747515, 1775670, 1911990, 1991010, 2003001

Offset: 1

Author

Massimo Kofler, May 02 2023

Keywords

• nonn

Examples

			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.
		

Crossrefs

Intersection of A000217 and A067885.

Programs

Mathematica

Select[Accumulate[Range[2000]], FactorInteger[#][[;; , 2]] == {1, 1, 1, 1, 1, 1} &] (* Amiram Eldar, May 02 2023 *)