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Search: id:A131640
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| A131640 |
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First differences are periodic: 50, 50, 75, 50, 50, 75, ... |
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+0
1
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| 985, 1035, 1085, 1160, 1210, 1260, 1335, 1385, 1435, 1510, 1560, 1610, 1685, 1735, 1785, 1860, 1910, 1960, 2035, 2085, 2135, 2210, 2260, 2310, 2385, 2435, 2485, 2560, 2610, 2660, 2735, 2785, 2835, 2910, 2960, 3010, 3085, 3135, 3185, 3260, 3310, 3360
(list; graph; listen)
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OFFSET
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0,1
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FORMULA
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a(n)=910+Sum_{k=0..n}{25/9*[4*(k mod 3)+7*((k+1) mod 3)+10*((k+2) mod 3)]}; - Paolo P. Lava (ppl(AT)spl.at), Sep 26 2007
G.f.: -5*(-197-10*x-10*x^2+182*x^3)/(-1+x)^2/(x^2+x+1). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 14 2007
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MAPLE
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A131640 := proc(n) option remember ; if n =0 then 985 ; elif n mod 3 = 0 then A131640(n-1)+75 ; else A131640(n-1)+50 ; fi ; end: seq(A131640(n), n=0..80) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 24 2007
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CROSSREFS
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Sequence in context: A122472 A087907 A096701 this_sequence A069299 A072316 A045733
Adjacent sequences: A131637 A131638 A131639 this_sequence A131641 A131642 A131643
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KEYWORD
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nonn,easy
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AUTHOR
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Eric M. Adler (eadler(AT)simi.k12.ca.us), Sep 05 2007
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EXTENSIONS
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Definition supplied by njas, Sep 14 2007
More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 24 2007
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