A066683 Number of badly sieved numbers <= n.

0, 1, 2, 2, 3, 3, 4, 5, 5, 5, 6, 7, 8, 8, 8, 8, 9, 10, 11, 11, 11, 11, 12, 12, 12, 12, 13, 13, 14, 15, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 21, 22, 22, 22, 23, 23, 23, 23, 23, 23, 24, 24, 25, 25, 26, 26, 26, 26

Offset

1,3

Links

Table of n, a(n) for n=1..66.

Formula

a(n) = Sum_{k=1..n} A099104(k).

Crossrefs

Cf. A099104, A066680, A000720.

Sequence in context: A085970 A355538 A238884 * A055038 A276796 A309093

Adjacent sequences: A066680 A066681 A066682 * A066684 A066685 A066686

Keyword

nonn

Author

Reinhard Zumkeller, Dec 31 2001

Status

approved