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Search: id:A074488
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| A074488 |
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a(1)=1, then "jump over next cube a(n) = 2*(a(n-1)+1)^3-(n-1). |
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| 1, 15, 8177, 1093884103327, 2617845000308809034415180474721383777, 35880772304755070470965980424546414275930627947903988794595699467727630030276033\ 995103117884255220637999070127
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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The rule "jump over next smth" can be varied, see A075694, A075695.
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FORMULA
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a(1)=1, a(n) = 2*(a(n-1)+1)^3-a(n-1).
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EXAMPLE
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a(1)=1; next cube is (a(1)+1)^3=8; "jump over" it: 8+(8-1)=15; a(2)=15; next cube is (a(2)+1)^3=4096; "jump over" it: 4096+(4096-15)=8177.
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MAPLE
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a(1) := 1; a(n) := 2*(a(n-1)+1)^2-a(n-1);
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CROSSREFS
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Cf. A075694, A075695.
Sequence in context: A027513 A066968 A113795 this_sequence A059950 A140285 A112614
Adjacent sequences: A074485 A074486 A074487 this_sequence A074489 A074490 A074491
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KEYWORD
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easy,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Sep 26 2002
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