A109274 Numbers n such that n+1 is prime, 2n+1 composite.

1, 4, 10, 12, 16, 22, 28, 40, 42, 46, 52, 58, 60, 66, 70, 72, 82, 88, 100, 102, 106, 108, 112, 126, 130, 136, 148, 150, 162, 166, 172, 178, 180, 190, 192, 196, 222, 226, 232, 238, 240, 250, 256, 262, 268, 276, 280, 282, 292, 310, 312, 316, 346, 348, 352, 358