A043356 Numbers n such that number of 1's in base 5 is 4.

156, 656, 756, 776, 780, 782, 783, 784, 786, 791, 796, 806, 831, 856, 906, 1031, 1156, 1406, 2031, 2656, 3156, 3256, 3276, 3280, 3282, 3283, 3284, 3286, 3291, 3296, 3306, 3331, 3356, 3406, 3531, 3656, 3756, 3776, 3780