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Search: id:A131030
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| A131030 |
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Periodic sequence (16, 7, 7, 16, 25, 25). |
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+0
11
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| 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16
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OFFSET
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1,1
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COMMENT
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Sixth column of triangular array T defined in A131022.
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FORMULA
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a(1) = a(4) = 16, a(2) = a(3) = 7, a(5) = a(6) = 25; for n > 6, a(n) = a(n-6).
G.f.: (16-25*x+25*x^2)/((1-x)*(1-x+x^2)).
a(n)=1/30*{77*(n mod 6)+32*[(n+1) mod 6]-13*[(n+2) mod 6]-13*[(n+3) mod 6]+32*[(n+4) mod 6]+77*[(n+5) mod 6]}, with n>=0. - Paolo P. Lava (ppl(AT)spl.at), Jun 19 2007
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PROGRAM
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(PARI) {m=79; for(n=1, m, r=(n-1)%6; print1(if(r==0||r==3, 16, if(r==1||r==2, 7, 25)), ", "))}
(MAGMA) m:=79; [ [16, 7, 7, 16, 25, 25][(n-1) mod 6 + 1]: n in [1..m] ];
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CROSSREFS
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Cf. A131022. Other columns of T are in A088911, A131026, A131027, A131028, A131029.
Sequence in context: A070568 A141078 A057964 this_sequence A070580 A028579 A007263
Adjacent sequences: A131027 A131028 A131029 this_sequence A131031 A131032 A131033
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KEYWORD
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nonn
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AUTHOR
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Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), following a suggestion of Paul Curtz (bpcrtz(AT)free.fr), Jun 10 2007
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