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A178424
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17 followed by the base-18 Fermat numbers.
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0
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17, 19, 325, 104977, 11019960577, 121439531096594251777, 14747559712960682275277163588165279154177, 217490517487340961382742893166950969620647214876916403331613367885781133978238
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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)= 18^(2^(n-1))+1, n>0.
a(n)= 2+ product_{i<n} a(i).
a(n)= 1 + (a(n-1)-1)^2, n>1.
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MATHEMATICA
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Clear[a, n];
a[0] := 17;
a[n_] := a[n] = Product[a[i], {i, 0, n - 1}] + 2;
Table[a[n], {n, 0, 10}]
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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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EXTENSIONS
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Edited by the Assoc. Eds. of the OEIS, Jul 20 2010
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STATUS
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approved
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