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 A068954 Smallest prime factor of n^n-(n-1)^(n-1). 3
 3, 23, 229, 19, 101, 776887, 3, 7, 29, 275311670611, 5, 28201, 3, 52489, 109, 808793517812627212561, 9680119, 5, 3, 1137694897331, 3697, 29, 6361, 10667, 3, 23, 17787551, 41393681953973, 7, 4211, 3, 461, 83, 19, 31, 983, 3, 5, 89, 2251, 250460976091, 109, 3, 29 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 LINKS Chai Wah Wu, Table of n, a(n) for n = 2..107 FORMULA a(n) = A020639(A007781(n)). EXAMPLE A007781(14) = 10809131718965763 = 3 * 61^2 * 968299894201, therefore a(14) = 3. CROSSREFS Cf. A020639, A007781, A068955, A068956. Sequence in context: A206763 A306154 A201205 * A068955 A151393 A007781 Adjacent sequences:  A068951 A068952 A068953 * A068955 A068956 A068957 KEYWORD nonn AUTHOR Reinhard Zumkeller, Mar 11 2002 EXTENSIONS a(20)-a(40) from Daniel Starodubtsev, Mar 10 2019 a(41)-a(45) from Chai Wah Wu, Jul 15 2019 STATUS approved

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Last modified May 10 00:50 EDT 2021. Contains 343747 sequences. (Running on oeis4.)