A141469 Nonprimes of the form c(c(i)-3)-3, where A002808(i)=c(i)=i-th composite.

1, 9, 18, 22, 24, 25, 27, 30, 32, 33, 35, 42, 45, 46, 48, 49, 51, 55, 57, 62, 63, 65, 66, 69, 72, 74, 77, 81, 82, 84, 87, 88, 91, 93, 95, 96, 99, 102, 105, 108, 111, 112, 115, 116, 117, 118, 119, 120, 121, 123, 125, 126, 129, 132, 133, 140, 141, 143, 144, 145, 147, 150

Offset

1,2

Links

Table of n, a(n) for n=1..62.

Example

If i=1, then c(c(1)-3)-3=c(4-3)-3=4-3=1=a(1).
If i=4, then c(c(4)-3)-3=c(9-3)-3=12-3=9=a(2).
If i=8, then c(c(8)-3)-3=c(15-3)-3=21-3=18=a(3).
If i=10, then c(c(10)-3)-3=c(18-3)-3=25-3=22=a(4).
If i=11, then c(c(11)-3)-3=c(20-3)-3=27-3=24=a(5),
etc.

Crossrefs

Cf. A002808.

Sequence in context: A208135 A306382 A222623 * A046412 A171081 A232056

Adjacent sequences: A141466 A141467 A141468 * A141470 A141471 A141472

Keyword

nonn

Author

Juri-Stepan Gerasimov, Aug 29 2008

Extensions

58 and 73 removed by R. J. Mathar, Sep 05 2008

Status

approved