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A020730
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Pisot sequences L(3,7) or S(3,7).
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2
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3, 7, 17, 42, 104, 258, 641, 1593, 3959, 9840, 24458, 60793, 151108, 375597, 933592, 2320557, 5768028, 14337139, 35636713, 88579410, 220174961, 547271804, 1360311028, 3381219496, 8404434755, 20890250880, 51925274519, 129066622961, 320810882887
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OFFSET
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0,1
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COMMENTS
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Coincides with the Shallit (generalized Pisot) sequence S(3,7) - as defined in A022020 - at least up to n=30000. - R. J. Mathar, Feb 12 2016
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LINKS
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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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See A008776 for definitions of Pisot sequences.
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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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