A028437 Golc sequence in base 7. Left to right concatenation of n,int(log_7(n)),int(log_7(int(log_7(n)))),... in base7.

7, 14, 21, 28, 35, 42, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 120, 127, 134, 141, 148, 155, 162, 169, 176, 183, 190, 197, 204, 211, 218, 225, 232, 239, 246, 253, 260, 267, 274, 281, 288, 295, 302, 309, 316, 323, 330, 337, 2415, 2464, 2513, 2562, 2611