A141632 Nonprimes of the form c(c(c(c(i)-3)-3)-3)-3, where A002808(i)=c(i)=i-th composite.

1, 24, 27, 33, 35, 46, 48, 51, 57, 62, 65, 69, 74, 77, 82, 87, 88, 91, 95, 102, 105, 111, 112, 115, 116, 119, 121, 123, 125, 126, 132, 140, 141, 143, 144, 150, 153, 156, 158, 161, 162, 166, 169, 171, 175, 180, 183, 184, 185, 192, 195, 200, 202, 205, 206, 213

Offset

1,2

Links

Table of n, a(n) for n=1..56.

Example

If i=1, then
c(c(c(c(1)-3)-3)-3)-3=c(c(c(4-3)-3)-3)-3=c(c(4-3)-3)-3=c(4-3)-3=c(1)-3=4-3=1=a(1).
If i=5, then
c(c(c(c(5)-3)-3)-3)-3=c(c(c(10-3)-3)-3)-3=c(c(14-3)-3)-3=c(20-3)-3=c(17)-3=27-3=24=a(2).
If i=6, then
c(c(c(c(6)-3)-3)-3)-3=c(c(c(12-3)-3)-3)-3=c(c(16-3)-3)-3=c(22-3)-3=c(19)-3=30-3=27=a(3).
If i=7, then
c(c(c(c(7)-3)-3)-3)-3=c(c(c(14-3)-3)-3)-3=c(c(20-3)-3)-3=c(27-3)-3=c(24)-3=36-3=33=a(4).
If i=8, then
c(c(c(c(8)-3)-3)-3)-3=c(c(c(15-3)-3)-3)-3=c(c(21-3)-3)-3=c(28-3)-3=c(25)-3=38-3=35=a(5),
etc.

Crossrefs

Cf. A002808.

Sequence in context: A345499 A071833 A064159 * A308603 A141634 A162465

Adjacent sequences: A141629 A141630 A141631 * A141633 A141634 A141635

Keyword

nonn

Author

Juri-Stepan Gerasimov, Aug 29 2008

Extensions

85 removed,105 added by R. J. Mathar, Sep 05 2008

Status

approved