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Search: id:A047467
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| A047467 |
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Numbers that are congruent to {0, 2} mod 8. |
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+0
3
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| 0, 2, 8, 10, 16, 18, 24, 26, 32, 34, 40, 42, 48, 50, 56, 58, 64, 66, 72, 74, 80, 82, 88, 90, 96, 98, 104, 106, 112, 114, 120, 122, 128, 130, 136, 138, 144, 146, 152, 154, 160, 162, 168, 170, 176, 178, 184, 186, 192
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n) = 4*n-5-(-1)^n = 2*A042948(n-1). G.f.: 2*x^2*(1+3x)/((1-x)^2*(1+x)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 19 2008]
a(n)=8*n-a(n-1)-14 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 24 2009]
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EXAMPLE
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For n=2, a(2)=8*2-0-14=2; n=3, a(3)=8*3-2-14=8; n=4, a(4)=8*4-8-14=10 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 24 2009]
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CROSSREFS
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Sequence in context: A161349 A073886 A079930 this_sequence A126002 A079599 A110913
Adjacent sequences: A047464 A047465 A047466 this_sequence A047468 A047469 A047470
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KEYWORD
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nonn,new
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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