Hello, With current Maxima I get (%i1) block([obase : 16], makelist(concat(k), k, 0, 15)) ; (%o1) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0A, 0B, 0C, 0D, 0E, 0F] But with older versions the output was [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F] Is this change intentional? -- Mario