A086133 Smallest prime factor of arithmetic derivative of n equals that of n.

4, 8, 12, 16, 20, 24, 27, 28, 32, 36, 40, 44, 45, 48, 52, 56, 60, 63, 64, 68, 72, 76, 80, 84, 88, 92, 96, 99, 100, 104, 108, 112, 116, 117, 120, 124, 128, 132, 136, 140, 144, 148, 152, 153, 156, 160, 164, 168, 171, 172, 175, 176, 180, 184, 188, 192, 196, 200, 204