a(n) = A019565(1+n) - A019565(A001065(n)), where A019565 is the base-2 exp-function, and A001065 is the sum of proper divisors of n.

A379496

a(n) = A019565(1+n) - A019565(A001065(n)), where A019565 is the base-2 exp-function, and A001065 is the sum of proper divisors of n.

Terms

    a(0) =2a(1) =4a(2) =3a(3) =4a(4) =13a(5) =15a(6) =5a(7) =-16a(8) =16a(9) =35a(10) =33a(11) =59a(12) =103a(13) =189a(14) =-3a(15) =-188a(16) =31a(17) =-44a(18) =53a(19) =-55a(20) =123a(21) =225a(22) =75a(23) =89a(24) =216a(25) =451a(26) =315a(27) =385a(28) =1153a(29) =2037

External references