login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A104774 If n is even then (if n<=4 then n else a(n/2) + 0^a(n/2) - 1) else (if n=p*q is semiprime then p+q else 0^(n-1))). 2

%I

%S 1,2,0,4,0,0,0,3,6,0,0,0,0,0,8,2,0,5,0,0,10,0,0,0,10,0,0,0,0,7,0,1,14,

%T 0,12,4,0,0,16,0,0,9,0,0,0,0,0,0,14,9,20,0,0,0,16,0,22,0,0,6,0,0,0,0,

%U 18,13,0,0,26,11,0,3,0,0,0,0,18,15,0,0,0,0,0,8,22,0,32,0,0,0,20,0,34,0,24

%N If n is even then (if n<=4 then n else a(n/2) + 0^a(n/2) - 1) else (if n=p*q is semiprime then p+q else 0^(n-1))).

%C a(A104772(n)) = n; a(A104773(n)) = A104772(n).

%Y Cf. A001358, A046315, A090967.

%K nonn

%O 1,2

%A _Reinhard Zumkeller_, Mar 24 2005

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 31 06:22 EDT 2020. Contains 334747 sequences. (Running on oeis4.)