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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