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Search: id:A142347
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| A142347 |
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Nonprimes of the form (p(n)+r(n))/2, where p(n)=n-th prime and r(n)=n-th nonprime. |
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+0
1
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| 1, 22, 32, 42, 58, 66, 88, 99, 104, 114, 144, 166, 196, 200, 214, 221, 239, 253, 279, 287, 296, 300, 314, 326, 345, 354, 367, 372, 400, 407, 418, 426, 442, 454, 472, 482, 502, 506, 513, 538, 556, 566, 573, 580, 590, 612, 618, 625, 630, 669, 698, 708, 717, 725
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OFFSET
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1,2
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EXAMPLE
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If n=1, then (p(1)+r(1))/2=(2+0)/2=1=a(1).
If n=10, then (p(10)+r(10))/2=(29+15)/2=22=a(2).
If n=14, then (p(14)+r(14))/2=(43+21)/2=32=a(3).
If n=17, then (p(17)+r(17))/2=(59+25)/2=42=a(4).
If n=23, then (p(23)+r(23))/2=(83+33)/2=58=a(5), etc.
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CROSSREFS
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Cf. A000040, A141468.
Sequence in context: A092215 A106555 A106557 this_sequence A121019 A167337 A100372
Adjacent sequences: A142344 A142345 A142346 this_sequence A142348 A142349 A142350
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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 19 2008
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