Triangular numbers with sum of digits = 15.

Terms

a(0) =78a(1) =276a(2) =465a(3) =528a(4) =780a(5) =861a(6) =1176a(7) =1275a(8) =1653a(9) =1770a(10) =2346a(11) =2850a(12) =3570a(13) =3741a(14) =4371a(15) =4560a(16) =5253a(17) =5460a(18) =6216a(19) =6441a(20) =7260a(21) =7503a(22) =11175a(23) =12246a(24) =12561a(25) =14028a(26) =15225a(27) =17205a(28) =20706a(29) =22155