a(n) = residue mod 3 of n-th term of A024702.

Terms

a(0) =1a(1) =2a(2) =2a(3) =1a(4) =0a(5) =0a(6) =1a(7) =2a(8) =1a(9) =0a(10) =1a(11) =2a(12) =2a(13) =0a(14) =1a(15) =2a(16) =1a(17) =0a(18) =0a(19) =2a(20) =2a(21) =0a(22) =2a(23) =2a(24) =1a(25) =0a(26) =0a(27) =1a(28) =0a(29) =1