Squares which are the concatenation of two or more powers of 2.

Terms

a(0) =81a(1) =121a(2) =144a(3) =324a(4) =441a(5) =484a(6) =841a(7) =1444a(8) =1681a(9) =2116a(10) =8281a(11) =8464a(12) =11664a(13) =11881a(14) =12321a(15) =14161a(16) =14641a(17) =14884a(18) =16641a(19) =28224a(20) =41616a(21) =43264a(22) =48841a(23) =114244a(24) =116281a(25) =128164a(26) =128881a(27) =142884a(28) =163216a(29) =166464