Numbers that are products of two triangular numbers in more than one way.

Terms

a(0) =36a(1) =45a(2) =210a(3) =315a(4) =360a(5) =630a(6) =780a(7) =990a(8) =1260a(9) =1386a(10) =1540a(11) =1800a(12) =2850a(13) =2970a(14) =3510a(15) =3570a(16) =3780a(17) =4095a(18) =4788a(19) =4851a(20) =6300a(21) =7920a(22) =8415a(23) =8550a(24) =8778a(25) =9450a(26) =11700a(27) =11781a(28) =14850a(29) =15400