Numbers whose square starts with exactly 4 identical digits.

Terms

a(0) =2357a(1) =2582a(2) =3334a(3) =4714a(4) =5774a(5) =6667a(6) =8165a(7) =8819a(8) =9428a(9) =10542a(10) =10543a(11) =10544a(12) =10545a(13) =14907a(14) =14908a(15) =14909a(16) =18257a(17) =18258a(18) =18259a(19) =21081a(20) =21082a(21) =21083a(22) =23570a(23) =23571a(24) =25819a(25) =25820a(26) =27888a(27) =27889a(28) =29813a(29) =29814