Numbers whose square starts with 4 identical digits.

Terms

a(0) =2357a(1) =2582a(2) =3334a(3) =4714a(4) =5774a(5) =6667a(6) =8165a(7) =8819a(8) =9428a(9) =10541a(10) =10542a(11) =10543a(12) =10544a(13) =10545a(14) =14907a(15) =14908a(16) =14909a(17) =18257a(18) =18258a(19) =18259a(20) =21081a(21) =21082a(22) =21083a(23) =23570a(24) =23571a(25) =25819a(26) =25820a(27) =27888a(28) =27889a(29) =29813