Multiplicative with a(2^e) = 2 for k >= 1; a(3) = 2, a(3^e) = 0 for k >= 2; a(p^e) = 0 if p > 3 and p == -1 (mod 3); a(p^e) = 2 if p > 3 and p == 1 (mod 3).
A000091
Multiplicative with a(2^e) = 2 for k >= 1; a(3) = 2, a(3^e) = 0 for k >= 2; a(p^e) = 0 if p > 3 and p == -1 (mod 3); a(p^e) = 2 if p > 3 and p == 1 (mod 3).
Terms
- a(0) =1a(1) =2a(2) =2a(3) =2a(4) =0a(5) =4a(6) =2a(7) =2a(8) =0a(9) =0a(10) =0a(11) =4a(12) =2a(13) =4a(14) =0a(15) =2a(16) =0a(17) =0a(18) =2a(19) =0a(20) =4a(21) =0a(22) =0a(23) =4a(24) =0a(25) =4a(26) =0a(27) =4a(28) =0a(29) =0
External references
- oeis: A000091