Square numbers whose iterative sums of digits are squares.

Terms

a(0) =0a(1) =1a(2) =4a(3) =9a(4) =36a(5) =81a(6) =100a(7) =121a(8) =144a(9) =225a(10) =324a(11) =400a(12) =441a(13) =900a(14) =1521a(15) =2025a(16) =2304a(17) =2601a(18) =3600a(19) =8100a(20) =10000a(21) =10201a(22) =10404a(23) =11025a(24) =12100a(25) =12321a(26) =14400a(27) =22500a(28) =32400a(29) =40000