A039324 Numbers whose base-7 representation has the same nonzero number of 3's and 5's.

26, 38, 75, 87, 124, 136, 152, 159, 166, 180, 182, 183, 184, 186, 188, 194, 222, 234, 248, 255, 262, 266, 267, 268, 270, 272, 276, 290, 320, 332, 369, 381, 418, 430, 467, 479, 495, 502, 509, 523, 525, 526, 527, 529, 531, 537, 565, 577, 591, 598, 605, 609