Numbers that are the sum of two triangular numbers.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =6a(6) =7a(7) =9a(8) =10a(9) =11a(10) =12a(11) =13a(12) =15a(13) =16a(14) =18a(15) =20a(16) =21a(17) =22a(18) =24a(19) =25a(20) =27a(21) =28a(22) =29a(23) =30a(24) =31a(25) =34a(26) =36a(27) =37a(28) =38a(29) =39