Triangular numbers for which the sum of the digits is a hexagonal number.

Terms

a(0) =0a(1) =1a(2) =6a(3) =10a(4) =15a(5) =78a(6) =105a(7) =231a(8) =276a(9) =465a(10) =528a(11) =780a(12) =861a(13) =1176a(14) =1275a(15) =1653a(16) =1770a(17) =2211a(18) =2346a(19) =2850a(20) =3003a(21) =3570a(22) =3741a(23) =4371a(24) =4560a(25) =5253a(26) =5460a(27) =5995a(28) =6216a(29) =6441