A063176 Composites for which the row of the prime-composite array (A063173) includes the leftmost element of both a zero-only antidiagonal and a zero-only diagonal(A067681).

15, 21, 51, 99, 249, 309, 339, 441, 615, 1065, 1071, 1275, 1311, 1461, 1665, 1719, 1935, 2445, 2451, 2499, 2511, 2781, 2829, 2949, 3015, 3129, 3435, 3759, 3789, 3795, 3819, 3939, 4161, 4221, 4761, 4809, 5709, 5721, 6291, 6555, 6699, 6855, 6921, 7071

Offset

1,1

Links

Table of n, a(n) for n=1..44.

N. Fernandez, The prime-composite array, B(m,n) and the Borve conjectures

Example

The 12th composite is 21. In the prime-composite array (A063173), all of the elements in the antidiagonal containing T(12,1) are 0 and so are all the elements of the diagonal containing T(12,1). So 21 is in the sequence.

Crossrefs

Cf. A063173, A063174, A063175, A067681.

Sequence in context: A129752 A015831 A275169 * A083372 A119101 A342806

Adjacent sequences: A063173 A063174 A063175 * A063177 A063178 A063179

Keyword

nonn

Author

Neil Fernandez, Jul 09 2001

Extensions

Edited and extended by Robert G. Wilson v, Feb 07 2002

Status

approved