A056135 Smallest positive integer other than n where geometric mean of n and a(n) is an integer.
4, 8, 12, 1, 20, 24, 28, 2, 1, 40, 44, 3, 52, 56, 60, 1, 68, 2, 76, 5, 84, 88, 92, 6, 1, 104, 3, 7, 116, 120, 124, 2, 132, 136, 140, 1, 148, 152, 156, 10, 164, 168, 172, 11, 5, 184, 188, 3, 1, 2, 204, 13, 212, 6, 220, 14, 228, 232, 236, 15, 244, 248, 7, 1, 260, 264, 268, 17
Offset: 1