Internal digits of n^2 include digits of n as substring.

Terms

a(0) =50a(1) =60a(2) =250a(3) =500a(4) =600a(5) =760a(6) =2500a(7) =3760a(8) =3792a(9) =5000a(10) =6000a(11) =6250a(12) =7600a(13) =14651a(14) =25000a(15) =37600a(16) =50000a(17) =60000a(18) =62500a(19) =76000a(20) =93760a(21) =250000a(22) =376000a(23) =495475a(24) =500000a(25) =505025a(26) =600000a(27) =625000a(28) =760000a(29) =906250