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Search: id:A117805
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| A117805 |
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Start with 3. Square the previous term and subtract it. |
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+0
2
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| 3, 6, 30, 870, 756030, 571580604870, 326704387862983487112030, 106735757048926752040856495274871386126283608870, 11392521832807516835658052968328096177131218666695418950023483907701862019030266123104859068030
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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The next term is too large to include.
Apparently a(n)=A005267(n+1)+1. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 22 2007. This is true by induction. - M. F. Hasler (maximilian.hasler(AT)gmail.com), May 04 2007
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FORMULA
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a(0) = 3, a(n) = (a(n-1))^2 - a(n-1).
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EXAMPLE
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Start with 3, 3^2-3 = 6; 6^2-6 = 30 etc
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MAPLE
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f:=proc(n) option remember; if n=0 then RETURN(3); else RETURN(f(n-1)^2-f(n-1)); fi; end;
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CROSSREFS
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Sequence in context: A061137 A012280 A002164 this_sequence A103091 A101751 A133665
Adjacent sequences: A117802 A117803 A117804 this_sequence A117806 A117807 A117808
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KEYWORD
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easy,nonn
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AUTHOR
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Jacob Vecht (vecht(AT)alcielo.com), Apr 29 2006
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