|
Search: id:A141218
|
|
|
| A141218 |
|
Nonprimes of the form ((p(max)-1)*..*p*(p(min)+1)), where a(0)=1 and (p(max))*..*p*(p(min)=k(n)=n-th nonprime. |
|
+0
4
|
|
| 1, 6, 6, 8, 12, 12, 18, 16, 12, 18, 24, 24, 30, 24, 24, 36, 24, 36, 36, 24, 40, 48, 36, 36, 54, 48, 48, 54, 60, 48, 66, 48, 48, 60, 64, 72, 54, 60, 72, 72, 84, 72, 90, 72, 48, 72, 90, 96, 88, 90, 72, 108, 80, 108, 80, 108, 96, 72, 120, 108, 96, 126, 112, 120, 108, 96, 132, 120
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
EXAMPLE
|
If k(1)=4=(p(max)=2)*(p(min)=2), then (2-1)*(2+1)=1*3=3
(prime).
If k(2)=6=(p(max)=3)*(p(min)=2), then
(3-1)*(2+1)=2*3=6 (nonprime)=a(1).
If k(3)=8=(p(max)=2)*(p=2)*(p(min)=2), then
(2-1)*2*(2+1)=1*2*3=6 (nonprime)=a(2), etc.
|
|
CROSSREFS
|
Sequence in context: A088684 A088683 A000509 this_sequence A160257 A083507 A157320
Adjacent sequences: A141215 A141216 A141217 this_sequence A141219 A141220 A141221
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Juri-Stepan Gerasimov (2stepan(AT)rambler.ru) Aug 7 2008
|
|
EXTENSIONS
|
a(27), a(41), a(53) corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 18 2008
|
|
|
Search completed in 0.002 seconds
|
