A167223 Number of primes of the form n^3 - k^2, 0<=k<=A077121(n).

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

Offset

0,4

Comments

Number of terms per row in the table of A167224;

a(n) <= A077121(n).

Links

R. Zumkeller, Table of n, a(n) for n = 0..500

Example

a(3) = #{27-4, 27-16, 27-25} = #{23, 11, 2} = 3;
a(4) = #{} = 0;
a(5) = #{125-16, 125-36, 125-64} = #{109, 89, 61} = 3.

Crossrefs

Sequence in context: A066851 A288571 A270028 * A341480 A261922 A078907

Adjacent sequences: A167220 A167221 A167222 * A167224 A167225 A167226

Keyword

nonn

Author

Reinhard Zumkeller, Oct 31 2009

Status

approved