A067261 Numbers n such that sigma(n+1)=3*phi(n).

1, 4, 5, 9, 10, 21, 32, 34, 45, 55, 65, 68, 70, 129, 153, 160, 176, 183, 203, 245, 340, 370, 407, 441, 550, 580, 635, 741, 765, 806, 845, 965, 1011, 1025, 1089, 1166, 1247, 1292, 1505, 1508, 1840, 2271, 2402, 2584, 2590, 3285, 3604, 4065, 4223, 4832, 5339