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Search: id:A147677
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| A147677 |
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Subtract 5, add 8, repeat. |
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+0
1
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| 7, 2, 10, 5, 13, 8, 16, 11, 19, 14, 22, 17, 25, 20, 28, 23, 31, 26, 34, 29, 37, 32, 40, 35, 43, 38, 46, 41, 49, 44, 52, 47, 55, 50, 58, 53, 61, 56, 64, 59, 67, 62, 70, 65, 73, 68, 76, 71, 79, 74, 82, 77, 85, 80, 88, 83, 91, 86, 94, 89, 97, 92, 100, 95, 103, 98, 106, 101, 109
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A147675-A147678 are from a quiz that someone asked me to help them with.
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FORMULA
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Contribution from Zak Seidov (zakseidov(AT)yahoo.com), Apr 22 2009: a(1)=7, a(2)=2, then a(n)=a(n-2)+3; a(n)=(1/4)*(6*n+9-13*(-1)^n).
a(n)=a(n-1)+a(n-2)-a(n-3) = 3*n/2+9/4+13*(-1)^(n+1)/4. G.f.: x*(7-5*x+x^2)/((1+x)*(x-1)^2). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 22 2009]
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CROSSREFS
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Sequence in context: A156547 A003673 A021141 this_sequence A090243 A145338 A104586
Adjacent sequences: A147674 A147675 A147676 this_sequence A147678 A147679 A147680
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Apr 21 2009
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EXTENSIONS
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More terms from Zak Seidov (zakseidov(AT)yahoo.com) and R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 22 2009
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