Both primitively and imprimitively represented by x^2+y^2.

Terms

a(0) =25a(1) =50a(2) =125a(3) =169a(4) =250a(5) =289a(6) =325a(7) =338a(8) =425a(9) =578a(10) =625a(11) =650a(12) =725a(13) =841a(14) =845a(15) =850a(16) =925a(17) =1025a(18) =1250a(19) =1325a(20) =1369a(21) =1445a(22) =1450a(23) =1525a(24) =1625a(25) =1681a(26) =1682a(27) =1690a(28) =1825a(29) =1850