a(n) = residue mod 7 of n-th term of A024702.

Terms

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