|
| |
|
|
A141469
|
|
Nonprimes of the form c(c(i)-3)-3, where A002808(i)=c(i)=i-th composite.
|
|
0
| |
|
|
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
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
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: A092457 A062057 A015785 * A046412 A171081 A109661
Adjacent sequences: A141466 A141467 A141468 * A141470 A141471 A141472
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Aug 29 2008
|
|
|
EXTENSIONS
| 58 and 73 removed by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 05 2008
|
| |
|
|
