Squares mod 90.

Terms

a(0) =0a(1) =1a(2) =4a(3) =9a(4) =10a(5) =16a(6) =19a(7) =25a(8) =31a(9) =34a(10) =36a(11) =40a(12) =45a(13) =46a(14) =49a(15) =54a(16) =55a(17) =61a(18) =64a(19) =70a(20) =76a(21) =79a(22) =81a(23) =85