a(n) = 2^n mod n.

Terms

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