A015709 Composite n such that phi(n) * sigma(n) is one less than a square.

6, 22, 33, 44, 69, 76, 82, 140, 190, 295, 354, 392, 423, 451, 531, 581, 650, 944, 1072, 1119, 1142, 1150, 1668, 2276, 2893, 4043, 4163, 4176, 4192, 4257, 4262, 4509, 5090, 5975, 7260, 8660, 12977, 14927, 15026, 15753, 16064, 19105