Numbers that are the sum of three squares in arithmetic progression.

Terms

a(0) =75a(1) =300a(2) =507a(3) =675a(4) =867a(5) =1200a(6) =1875a(7) =2028a(8) =2523a(9) =2700a(10) =3468a(11) =3675a(12) =4107a(13) =4563a(14) =4800a(15) =5043a(16) =6075a(17) =7500a(18) =7803a(19) =8112a(20) =8427a(21) =9075a(22) =10092a(23) =10800a(24) =11163a(25) =12675a(26) =13872a(27) =14700a(28) =15987a(29) =16428