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

1,1

Links

Table of n, a(n) for n=1..34.

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

Intersection of A000217 and A067885.

Sequence in context: A178285 A101701 A092011 * A216900 A072679 A147705

Adjacent sequences: A362755 A362756 A362757 * A362759 A362760 A362761

Keyword

nonn

Author

Massimo Kofler, May 02 2023

Status

approved