a(n) = n' - n''*2, where n' is the arithmetic derivative of n, A003415(n) and n'' is the second arithmetic derivative, A068346(n).

A368922

a(n) = n' - n''*2, where n' is the arithmetic derivative of n, A003415(n) and n'' is the second arithmetic derivative, A068346(n).

Terms

    a(0) =0a(1) =0a(2) =1a(3) =1a(4) =-4a(5) =1a(6) =3a(7) =1a(8) =-20a(9) =-4a(10) =5a(11) =1a(12) =-48a(13) =1a(14) =-3a(15) =-16a(16) =-128a(17) =1a(18) =1a(19) =1a(20) =-64a(21) =-4a(22) =11a(23) =1a(24) =-52a(25) =-4a(26) =-1a(27) =-27a(28) =-128a(29) =1

External references