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A048626
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Pisot sequence P(6,9).
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2
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6, 9, 13, 19, 28, 41, 60, 88, 129, 189, 277, 406, 595, 872, 1278, 1873, 2745, 4023, 5896, 8641, 12664, 18560, 27201, 39865, 58425, 85626, 125491, 183916, 269542, 395033, 578949, 848491, 1243524, 1822473, 2670964, 3914488, 5736961, 8407925, 12322413, 18059374
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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) = a(n-1) + a(n-3) (Checked up to n = 1000)
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MATHEMATICA
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PROG
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(PARI) pisotP(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]-1/2));
a
}
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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