a(n) = 2^(k-1)-2^(j-1), where (2^(k-1),2^(j-1)) is the least pair of distinct positive powers of 2 for which n divides 2^(k-1)-2^(j-1).

A204983

a(n) = 2^(k-1)-2^(j-1), where (2^(k-1),2^(j-1)) is the least pair of distinct positive powers of 2 for which n divides 2^(k-1)-2^(j-1).

Terms

    a(0) =1a(1) =2a(2) =3a(3) =4a(4) =15a(5) =6a(6) =7a(7) =8a(8) =63a(9) =30a(10) =1023a(11) =12a(12) =4095a(13) =14a(14) =15a(15) =16a(16) =255a(17) =126a(18) =262143a(19) =60a(20) =63a(21) =2046a(22) =2047a(23) =24a(24) =1048575a(25) =8190a(26) =262143a(27) =28a(28) =268435455a(29) =30

External references