Second hexagonal numbers having middle divisors.

Terms

a(0) =36a(1) =210a(2) =300a(3) =528a(4) =990a(5) =1176a(6) =1485a(7) =1596a(8) =2080a(9) =2346a(10) =3240a(11) =3570a(12) =4095a(13) =4278a(14) =4851a(15) =5460a(16) =6555a(17) =6786a(18) =7260a(19) =8256a(20) =8778a(21) =9870a(22) =10440a(23) =11628a(24) =12880a(25) =13530a(26) =14196a(27) =14535a(28) =15225a(29) =15576