Triangular numbers that are palindromes in base 5.

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =36a(5) =78a(6) =378a(7) =1953a(8) =20706a(9) =23436a(10) =48828a(11) =147696a(12) =239778a(13) =426426a(14) =449826a(15) =1220703a(16) =2155926a(17) =6011778a(18) =14625936a(19) =30517578a(20) =74218836a(21) =74316336a(22) =149083278a(23) =314290056a(24) =351562386a(25) =762939453a(26) =7897542681a(27) =9141750936a(28) =10201418541a(29) =19073486328