A141634 Nonprimes of the form c(c(c(c(c(i)-3)-3)-3)-3)-3, where A002808(i)=c(i)=i-th composite.

1, 24, 27, 33, 46, 48, 51, 62, 65, 69, 77, 82, 87, 91, 102, 105, 111, 115, 116, 119, 123, 126, 132, 141, 143, 144, 150, 153, 156, 158, 161, 162, 169, 175, 180, 183, 184, 192, 200, 202, 205, 206, 214, 216, 221, 228, 232, 234, 242, 243, 244, 246, 249, 252, 255, 258, 259, 265, 270, 272, 279, 286, 287, 288

Offset

1,2

Links

Table of n, a(n) for n=1..64.

Example

If i=1, then c(c(c(c(c(1)-3)-3)-3)-3)-3=c(c(c(c(4-3)-3)-3)-3)-3=c(c(c(4-3)-3)-3)-3=c(c(4-3)-3)-3=c(c(1)-3)-3=c(4-3)-3=4-3=1=a(1).
If i=3, then c(c(c(c(c(3)-3)-3)-3)-3)-3=c(c(c(c(8-3)-3)-3)-3)-3=c(c(c(10-3)-3)-3)-3=c(c(14-3)-3)-3=c(c(11)-3)-3=c(20-3)-3=27-3=24=a(2).
If i=4, then c(c(c(c(c(4)-3)-3)-3)-3)-3=c(c(c(c(9-3)-3)-3)-3)-3=c(c(c(12-3)-3)-3)-3=c(c(16-3)-3)-3=c(c(13)-3)-3=c(22-3)-3=30-3=27=a(3).
etc.

Crossrefs

Cf. A002808.

Sequence in context: A064159 A141632 A308603 * A162465 A067193 A095235

Adjacent sequences: A141631 A141632 A141633 * A141635 A141636 A141637

Keyword

nonn

Author

Juri-Stepan Gerasimov, Aug 29 2008

Extensions

Removed incorrect examples. Corrected roughly 20 percent of the values. - R. J. Mathar, Sep 05 2008

Status

approved