Bases b for which there exists an integer y such that y^2 in base b consists of 4 identical digits.

Terms

a(0) =7a(1) =41a(2) =99a(3) =239a(4) =1393a(5) =2943a(6) =8119a(7) =45368a(8) =47321a(9) =82417a(10) =144721a(11) =275807a(12) =470743a(13) =1607521a(14) =9369319a(15) =54608393a(16) =86105599a(17) =184424193a(18) =187869927a(19) =257926007a(20) =318281039a(21) =333815123a(22) =345611082a(23) =500001500a(24) =694220327a(25) =1176320495a(26) =1314587843a(27) =1397186643a(28) =1534997397a(29) =1855077841