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Search: id:A144478
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| A144478 |
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A144390 (1,9,23) mod 9. Period 9:repeat 1,0,5,7,6,2,4,3,8. |
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+0
2
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| 1, 0, 5, 7, 6, 2, 4, 3, 8, 1, 0, 5, 7, 6, 2, 4, 3, 8, 1, 0, 5, 7, 6, 2, 4, 3, 8, 1, 0, 5, 7, 6, 2, 4, 3, 8, 1, 0, 5, 7, 6, 2, 4, 3, 8, 1, 0, 5, 7, 6, 2, 4, 3, 8
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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The nine digits 0 to 8. Note nonaplet a(n+1)=0,5,7,6,2,4,3,8,1=b(n);b(0)+b(1)+b(2)=b(3)+b(4)+b(5)=b(6)+b(7)+b(8)=12, see A010851,A142069. b(n+3)-b(n)=period 9:repeat 6,-3,-3,-3,6,-3,-3,-3,6;odd palindrom.From Balmer spectrum of hydrogen.
Essentially the same as A145577. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 18 2009]
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FORMULA
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a(n)=(1/9)*{8*(n mod 9)-4*[(n+1) mod 9]+2*[(n+2) mod 9]-[(n+3) mod 9]+5*[(n+4) mod 9]+2*[(n+5) mod 9]-[(n+6) mod 9]-4*[(n+7) mod 9]+2*[(n+8) mod 9]}, with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Oct 13 2008]
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CROSSREFS
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Sequence in context: A139428 A063005 A145577 this_sequence A059249 A114603 A100554
Adjacent sequences: A144475 A144476 A144477 this_sequence A144479 A144480 A144481
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KEYWORD
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nonn,uned
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Oct 11 2008
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