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A141218
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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.
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3
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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; refs; listen; history; internal format)
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OFFSET
| 1,2
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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.
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CROSSREFS
| Sequence in context: A195707 A175217 A000509 * A160257 A183042 A083507
Adjacent sequences: A141215 A141216 A141217 * A141219 A141220 A141221
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KEYWORD
| nonn
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AUTHOR
| Juri-Stepan Gerasimov (2stepan(AT)rambler.ru) Aug 7 2008
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EXTENSIONS
| a(27), a(41), a(53) corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 18 2008
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