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A175985
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a(1) = 1, for n >= 2: a(n) = (a(n-1)+1)^(n-1) - 1.
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1
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OFFSET
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1,3
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COMMENTS
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The next term (a(7)) has 217 digits.
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LINKS
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FORMULA
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EXAMPLE
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For n = 4: a(4) = (3+1)^3 - 1 = 63.
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PROG
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(PARI) a(n)=if(n<=1, 1, (a(n-1)+1)^(n-1)-1); /* Joerg Arndt, Jun 10 2011 */
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CROSSREFS
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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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