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Search: id:A141219
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| A141219 |
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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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+0
4
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| 1, 4, 6, 8, 6, 8, 8, 12, 12, 12, 12, 16, 12, 16, 24, 14, 24, 16, 18, 24, 24, 18, 32, 24, 20, 28, 24, 24, 24, 36, 24, 32, 48, 30, 36, 28, 36, 48, 32, 40, 30, 36, 32, 48, 48, 56, 36, 36, 48, 40, 48, 38, 60, 40, 72, 42, 48, 72, 42, 48, 72, 44, 60, 48, 54, 84, 48, 64, 48, 80, 64, 56
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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If k(1)=4=(p(max)=2)*(p(min)=2), then (2+1)*(2-1)=3*1=3
(prime).
If k(2)=6=(p(max)=3)*(p(min)=2), then
(3+1)*(2-1)=4*1=4 (nonprime)=a(1).
If k(3)=8=(p(max)=2)*(p=2)*(p(min)=2), then
(2+1)*2*(2-1)=3*2*1=6 (nonprime)=a(2), etc.
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CROSSREFS
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Sequence in context: A071851 A083256 A083257 this_sequence A159576 A163639 A095253
Adjacent sequences: A141216 A141217 A141218 this_sequence A141220 A141221 A141222
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KEYWORD
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nonn
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru) Aug 7 2008
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EXTENSIONS
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a(6), a(54), a(71) corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 18 2008
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