Numbers equal to the sum of three triangular numbers in arithmetic progression.

Terms

a(0) =9a(1) =63a(2) =84a(3) =108a(4) =234a(5) =315a(6) =459a(7) =513a(8) =570a(9) =630a(10) =759a(11) =975a(12) =1053a(13) =1134a(14) =1395a(15) =1584a(16) =1998a(17) =2109a(18) =2709a(19) =2838a(20) =2970a(21) =3105a(22) =3384a(23) =3528a(24) =3825a(25) =4134a(26) =4455a(27) =4620a(28) =4788a(29) =4959