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A144747
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Recurrence sequence a(n)=a(n-1)^2-a(n-1)-1, a(0)=7.
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5
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7, 41, 1639, 2684681, 7207509387079, 51948191564824694742765161, 2698614606855723567054656642857156538246857652590759, 7282520796335071470236496456671241855257664867148949932302276253455702665493855273950765616767079605321
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OFFSET
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0,1
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COMMENTS
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a(0)=3 is the smallest integer generating an increasing sequence of the form a(n)=a(n-1)^2-a(n-1)-1, cf. A144743.
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LINKS
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FORMULA
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a(n)=a(n-1)^2-a(n-1)-1 and a(0)=7.
a(n) ~ c^(2^n), where c = 6.3622623884585267364822329679498420997632627444610172910703030892754... . - Vaclav Kotesovec, May 06 2015
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MATHEMATICA
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a = {}; k = 7; Do[k = k^2 - k - 1; AppendTo[a, k], {n, 1, 10}]; a
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PROG
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(PARI) a(n, s=7)={for(i=1, n, s=s^2-s-1); s} \\ M. F. Hasler, Oct 06 2014
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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