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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). 4
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 (list; graph; refs; listen; history; text; internal format)
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 A190662

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

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Last modified February 27 06:36 EST 2020. Contains 332299 sequences. (Running on oeis4.)