First digit after decimal point of square root of n.

Terms

a(0) =0a(1) =4a(2) =7a(3) =0a(4) =2a(5) =4a(6) =6a(7) =8a(8) =0a(9) =1a(10) =3a(11) =4a(12) =6a(13) =7a(14) =8a(15) =0a(16) =1a(17) =2a(18) =3a(19) =4a(20) =5a(21) =6a(22) =7a(23) =8a(24) =0a(25) =0a(26) =1a(27) =2a(28) =3a(29) =4