Square such that the next three squares also having a square digit sum.

Terms

a(0) =81a(1) =100a(2) =121a(3) =144a(4) =400a(5) =10000a(6) =10201a(7) =10404a(8) =12100a(9) =40000a(10) =1000000a(11) =1002001a(12) =1004004a(13) =1020100a(14) =1172889a(15) =1210000a(16) =1232100a(17) =2604996a(18) =4000000a(19) =4297329a(20) =4485924a(21) =6185169a(22) =11048976a(23) =11108889a(24) =12916836a(25) =14584761a(26) =16353936a(27) =23040000