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A063175 Composites for which the row of the prime-composite array (A063173) includes the leftmost element of a zero-only diagonal (A067677). 4
15, 21, 39, 51, 55, 75, 91, 99, 105, 121, 159, 165, 169, 187, 195, 249, 265, 285, 309, 325, 327, 339, 351, 385, 441, 471, 481, 489, 511, 517, 531, 595, 609, 615, 625, 685, 789, 805, 841, 879, 891, 909, 915, 939, 951, 955, 987, 999, 1027, 1035, 1045, 1057 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..52.

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 diagonal containing T(12,1) are 0. So 21 is in the sequence.

CROSSREFS

Cf. A063173, A063174, A063176, A067677.

Sequence in context: A081977 A180655 A254365 * A325658 A331628 A171569

Adjacent sequences:  A063172 A063173 A063174 * A063176 A063177 A063178

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 April 3 23:48 EDT 2020. Contains 333207 sequences. (Running on oeis4.)