Triangular numbers whose sum of triangular divisors is also triangular and greater than 1.

Terms

a(0) =6a(1) =4186a(2) =32131a(3) =52975a(4) =78210a(5) =111628a(6) =237016a(7) =247456a(8) =584821a(9) =750925a(10) =1464616a(11) =3649051a(12) =5791906a(13) =11297881a(14) =16082956a(15) =24650731a(16) =27243271a(17) =38618866a(18) =46585378a(19) =51546781a(20) =56026405a(21) =76923406a(22) =89880528a(23) =96070591a(24) =126906346a(25) =164629585a(26) =201854278a(27) =228733966