A101240 Slowest increasing sequence where the absolute difference between the last digit of a(n) and the first digit of a(n+1) equals 6.

1, 7, 17, 18, 28, 29, 30, 60, 61, 71, 72, 82, 83, 93, 97, 107, 117, 127, 137, 147, 157, 167, 177, 187, 197, 198, 208, 218, 228, 238, 248, 258, 268, 278, 288, 298, 299, 309, 319, 329, 339, 349, 359, 369, 379, 389, 390, 600, 610, 620, 630, 640, 650, 660, 670, 680