Numbers k such that k * (k + 8) is the concatenation of a number m with itself.

Terms

a(0) =3a(1) =93a(2) =377a(3) =616a(4) =707a(5) =902a(6) =993a(7) =8760a(8) =9993a(9) =45455a(10) =54538a(11) =99993a(12) =693062a(13) =999993a(14) =8181811a(15) =9999993a(16) =88235287a(17) =99999993a(18) =327935223a(19) =330669331a(20) =363636364a(21) =418318516a(22) =428571429a(23) =461538454a(24) =538461539a(25) =571428564a(26) =581681477a(27) =636363629a(28) =669330662a(29) =672064770