Smallest triangular number with value of the internal digits = n; or 0 if no such number exists.

Terms

a(0) =105a(1) =210a(2) =120a(3) =136a(4) =741a(5) =153a(6) =465a(7) =171a(8) =780a(9) =190a(10) =6105a(11) =0a(12) =1128a(13) =30135a(14) =2145a(15) =5151a(16) =3160a(17) =1176a(18) =4186a(19) =0a(20) =80200a(21) =2211a(22) =1225a(23) =0a(24) =3240a(25) =5253a(26) =7260a(27) =1275a(28) =0a(29) =10296