An Ulam number is a member of an integer sequence devised by and named after Stanislaw Ulam, who introduced it in 1964.
Prva Friedmanova števila v bazi 10 so :: 25, 121, 125, 126, 127, 128, 153, 216, 289, 343, 347, 625, 688, 736, 1022, 1024, 1206, 1255, 1260, 1285, 1296, 1395, 1435, 1503, 1530, 1792, 1827, 2048, 2187, 2349, 2500, 2501, 2502, 2503, 2504, 2505, 2506, 2507, 2508, 2509, 2592, 2737, 2916, 3125, 3159, 3375, ...V izrazih se lahko uporabljajo oklepaji, vendar samo za poničenje privzete prednosti operacij, na primer v 1024 = (4 - 2)10.