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Search: id:A133448
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| A133448 |
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a(n)=3a(n-1)-a(n-3)+3a(n-4). |
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+0
2
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OFFSET
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0,1
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COMMENT
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Sum of digits mod 9: 2, 5, 4, 4, 4, 5, 5, 5, ..., is hexaperiodic.
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FORMULA
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a(n)=(1/3)*{1/2-(1/2)*I]*sqrt(3)}^n+(3/2)*3^n-(1/6)*(-1)^n+(1/3)*{1/2+(1/2)*I*sqrt(3)}^n, with n>=0 and I=sqrt(-1) - Paolo P. Lava (ppl(AT)spl.at), Jun 09 2008
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CROSSREFS
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Sequence in context: A148305 A104447 A127986 this_sequence A149862 A149863 A149864
Adjacent sequences: A133445 A133446 A133447 this_sequence A133449 A133450 A133451
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Nov 27 2007
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