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 A007571 a(n) = largest prime factor of n^n + 1. (Formerly M1343) 8
 2, 5, 7, 257, 521, 97, 911, 673, 530713, 27961, 58367, 2227777, 79301, 176597, 142111, 67280421310721, 45957792327018709121, 33388093, 870542161121, 4406613081041681, 22864311556633, 73194743542229, 1522029233, 27250359649 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS Hugo Pfoertner, Table of n, a(n) for n = 1..123 factordb, Status of 120^120+1 ... 139^139+1. FORMULA a(n) = A006530(A014566(n)). - Michel Marcus, Aug 24 2019 MATHEMATICA Table[ FactorInteger[ n^n + 1, FactorComplete -> True ] [ [ -1, 1 ] ], {n, 1, 25} ] PROG (PARI) for(k=1, 24, my(x=factor(k^k+1), f=x[#x[, 1], 1]); print1(f, ", ")) \\ Hugo Pfoertner, Aug 23 2019 (MAGMA) [Max(PrimeDivisors(n^n+1)):n in [1..24]]; // Marius A. Burtea, Aug 24 2019 CROSSREFS Cf. A006530, A006486, A014566, A056790. Sequence in context: A042673 A214705 A252283 * A062621 A306748 A241292 Adjacent sequences:  A007568 A007569 A007570 * A007572 A007573 A007574 KEYWORD nonn,hard AUTHOR STATUS approved

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Last modified October 23 22:36 EDT 2019. Contains 328377 sequences. (Running on oeis4.)