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A133378
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a(1)=1. For n >= 2, a(n) = the largest prime divisor of (a(n-1)^a(n-1) + 1).
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0
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OFFSET
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1,2
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COMMENTS
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a(5) depends on the factorization of the 1408-digit composite number (521^521+1)/(2 * 3^2 * 29 * 375121); see factordb.com link. - Michael S. Branicky, Jan 27 2023
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LINKS
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Table of n, a(n) for n=1..4.
factordb.com, 521^521+1.
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MATHEMATICA
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NestList[FactorInteger[#^#+1][[-1, 1]]&, 1, 3] (* Harvey P. Dale, Jun 21 2012 *)
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CROSSREFS
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Cf. A007571.
Sequence in context: A138696 A163798 A081296 * A283561 A037063 A068105
Adjacent sequences: A133375 A133376 A133377 * A133379 A133380 A133381
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KEYWORD
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more,nonn,changed
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AUTHOR
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Leroy Quet, Oct 28 2007
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STATUS
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approved
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