A132387 a(n)=n with all digits d of n replaced by mod(d,4).

0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 10, 11, 12, 13, 10, 11, 12, 13, 10, 11, 20, 21, 22, 23, 20, 21, 22, 23, 20, 21, 30, 31, 32, 33, 30, 31, 32, 33, 30, 31, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 10, 11, 12, 13, 10, 11, 12, 13, 10, 11, 20, 21, 22, 23, 20, 21, 22, 23, 20, 21, 30, 31, 32, 33, 30, 31, 32