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%I #20 Oct 17 2019 01:58:11
%S 3,23,229,19,101,776887,3,7,29,275311670611,5,28201,3,52489,109,
%T 808793517812627212561,9680119,5,3,1137694897331,3697,29,6361,10667,3,
%U 23,17787551,41393681953973,7,4211,3,461,83,19,31,983,3,5,89,2251,250460976091,109,3,29
%N Smallest prime factor of n^n-(n-1)^(n-1).
%H Chai Wah Wu, <a href="/A068954/b068954.txt">Table of n, a(n) for n = 2..107</a>
%F a(n) = A020639(A007781(n)).
%e A007781(14) = 10809131718965763 = 3 * 61^2 * 968299894201, therefore a(14) = 3.
%Y Cf. A020639, A007781, A068955, A068956.
%K nonn
%O 2,1
%A _Reinhard Zumkeller_, Mar 11 2002
%E a(20)-a(40) from _Daniel Starodubtsev_, Mar 10 2019
%E a(41)-a(45) from _Chai Wah Wu_, Jul 15 2019
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