( n, k, d) Just the check bits; append an identity matrix for data bits
(23, 1,23)  0x00000000003fffff  0000000000000000000000000000000000000000001111111111111111111111
(35, 2,23)  0x00000001ffc007ff  0000000000000000000000000000000111111111110000000000011111111111
(41, 3,23)  0x0000003e0fc1f81f  0000000000000000000000000011111000001111110000011111100000011111