A013920 Composite numbers k such that the sum of all composites <= k is composite.

4, 6, 8, 9, 12, 14, 15, 16, 18, 20, 21, 22, 25, 26, 28, 30, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 55, 56, 57, 58, 60, 63, 64, 65, 69, 70, 72, 74, 77, 78, 80, 81, 82, 84, 85, 86, 90, 91, 92, 94, 95, 96, 98, 104, 105, 106, 108, 110, 111, 112, 114, 115, 116, 118, 119

Offset

1,1

Links

Table of n, a(n) for n=1..69.

Crossrefs

Cf. A013919, A013921.

Sequence in context: A273546 A176539 A285256 * A179891 A064590 A259315

Adjacent sequences: A013917 A013918 A013919 * A013921 A013922 A013923

Keyword

nonn

Author

N. J. A. Sloane, Henri Lifchitz

Extensions

More terms from David W. Wilson

Status

approved