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Search: id:A142338
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| A142338 |
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Nonprimes of the form (p(2*n)-p(n))/2*2, where p(n)=n-th prime. |
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+0
1
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| 1, 6, 12, 15, 16, 20, 24, 27, 33, 39, 42, 45, 45, 50, 52, 54, 55, 63, 63, 66, 70, 70, 70, 78, 81, 84, 86, 102, 105, 108, 110, 115, 117, 117, 118, 121, 121, 132, 133, 138, 141, 146, 148, 150, 156, 158, 165, 168, 168, 171, 180, 180, 182, 198, 203, 205, 205, 210, 210
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OFFSET
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1,2
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EXAMPLE
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If n=2, then (p(2*2)-p(2))/2*2=(7-3)/4=1=a(1).
If n=6, then (p(2*6)-p(6))/2*2=(37-13)/4=6=a(2).
If n=11, then (p(2*11)-p(11))/2*2=(79-31)/4=12=a(3).
If n=13, then (p(2*13)-p(13))/2*2=(101-41)/4=15=a(4).
If n=14, then (p(2*14)-p(14))/2*2=(107-43)/4=16=a(5), etc.
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CROSSREFS
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Cf. A000040, A141468.
Sequence in context: A113791 A135763 A030659 this_sequence A114304 A107487 A092671
Adjacent sequences: A142335 A142336 A142337 this_sequence A142339 A142340 A142341
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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), Sep 18 2008
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EXTENSIONS
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59 and 87 removed by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 04 2008
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