The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A167223 Number of primes of the form n^3 - k^2, 0<=k<=A077121(n). 2

%I #3 Mar 30 2012 18:51:05

%S 0,0,1,3,0,3,3,3,7,1,3,6,9,6,7,11,1,20,13,5,19,11,8,15,15,0,17,22,11,

%T 22,16,7,39,28,8,29,1,12,31,22,16,46,33,13,32,30,13,58,43,0,47,22,28,

%U 49,39,20,47,51,18,44,32,21,84,63,0,70,38,28,113,45,23,43,66,46,52,63,28,78

%N Number of primes of the form n^3 - k^2, 0<=k<=A077121(n).

%C Number of terms per row in the table of A167224;

%C a(n) <= A077121(n).

%H R. Zumkeller, <a href="/A167223/b167223.txt">Table of n, a(n) for n = 0..500</a>

%e a(3) = #{27-4, 27-16, 27-25} = #{23, 11, 2} = 3;

%e a(4) = #{} = 0;

%e a(5) = #{125-16, 125-36, 125-64} = #{109, 89, 61} = 3.

%K nonn

%O 0,4

%A _Reinhard Zumkeller_, Oct 31 2009

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 5 18:30 EDT 2024. Contains 373107 sequences. (Running on oeis4.)