A031484 n-th number k which in base 7 has 2 more 0's than 6's.

49, 98, 147, 196, 245, 344, 345, 346, 347, 348, 350, 357, 364, 371, 378, 392, 441, 490, 539, 588, 687, 688, 689, 690, 691, 693, 700, 707, 714, 721, 735, 784, 833, 882, 931, 1030, 1031, 1032, 1033, 1034, 1036, 1043, 1050, 1057