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A020743
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Pisot sequence L(7,10).
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3
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7, 10, 15, 23, 36, 57, 91, 146, 235, 379, 612, 989, 1599, 2586, 4183, 6767, 10948, 17713, 28659, 46370, 75027, 121395, 196420, 317813, 514231, 832042, 1346271, 2178311, 3524580, 5702889, 9227467, 14930354, 24157819, 39088171, 63245988, 102334157, 165580143
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = Fib(n+5)+2 = A157725(n+5). a(n) = 2a(n-1) - a(n-3).
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MATHEMATICA
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LinearRecurrence[{2, 0, -1}, {7, 10, 15}, 40] (* Harvey P. Dale, Jun 10 2022 *)
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PROG
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(PARI) pisotL(nmax, a1, a2) = {
a=vector(nmax); a[1]=a1; a[2]=a2;
for(n=3, nmax, a[n] = ceil(a[n-1]^2/a[n-2]));
a
}
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CROSSREFS
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Subsequence of A018910. See A008776 for definitions of Pisot sequences.
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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