Sum of digits of n is a square.

Terms

a(0) =1a(1) =4a(2) =9a(3) =10a(4) =13a(5) =18a(6) =22a(7) =27a(8) =31a(9) =36a(10) =40a(11) =45a(12) =54a(13) =63a(14) =72a(15) =79a(16) =81a(17) =88a(18) =90a(19) =97a(20) =100a(21) =103a(22) =108a(23) =112a(24) =117a(25) =121a(26) =126a(27) =130a(28) =135a(29) =144