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Search: id:A140209
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| A140209 |
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Nonprimes of the form ((x+y)/3+2)/(x-y), where x=prime and y=nonprime. |
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1
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| 1, 9, 10, 15, 25, 30, 32, 40, 42, 44, 45, 49, 58, 60, 65, 70, 72, 75, 80, 85, 87, 93, 94, 95, 98, 99, 100, 110, 114, 117, 120, 133, 135, 140, 155, 158, 159, 164, 170, 172, 175, 177, 184, 185, 192, 194, 198, 204, 205, 210, 213, 215, 220, 228, 235, 240, 247, 250, 252
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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x=p(i)=i-th prime and y=n(j)=j-th nonprime.
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EXAMPLE
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If x=5 and y=1, then ((5+1)/3+2)/(5-1)=4/4=1=a(1).
If x=53 and y=49, then ((53+49)/3+2)/(53-49)=36/4=9=a(2).
If x=59 and y=55, then ((59+55)/3+2)/(59-55)=40/4=10=a(3).
If x=89 and y=85, then ((89+85)/3+2)/(89-85)=90/4=15=a(4).
If x=149 and y=145, then ((149+145)/3+2)/(149-145)=100/4=25=a(5).
If x=179 and y=174, then ((179+174)/3+2)/(179-174)=120/4=30=a(6),
etc.
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CROSSREFS
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Cf. A000040, A002808, A018252, A141468.
Sequence in context: A114844 A005381 A099616 this_sequence A073829 A003135 A105742
Adjacent sequences: A140206 A140207 A140208 this_sequence A140210 A140211 A140212
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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 28 2008
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