Numbers of form x^2 + y^2 + 7z^2.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =5a(5) =7a(6) =8a(7) =9a(8) =10a(9) =11a(10) =12a(11) =13a(12) =15a(13) =16a(14) =17a(15) =18a(16) =20a(17) =23a(18) =24a(19) =25a(20) =26a(21) =27a(22) =28a(23) =29a(24) =30a(25) =32a(26) =33a(27) =34a(28) =36a(29) =37