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 A089825 Smallest n such that the least witness function W(n) = m, as m runs through the values in A089105. 2
 9, 2047, 1373653, 134670080641, 25326001, 307768373641, 3215031751, 1502401849747176241, 2152302898747, 1478868544880821, 3034679039109989281, 3474749660383 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The least witness of 3825123056546413051 is 37, and no smaller number has 37 as its least witness. [Charles R Greathouse IV, Aug 14 2010] REFERENCES R. Crandall and C. Pomerance, Prime Numbers: A Computational Perspective, Springer, NY, 2001; see p. 157 (p. 168 in the second printing). LINKS EXAMPLE Comment from Don Reble, May 27 2014: The sequence begins: 2 9 3 2047 5 1373653 6 134670080641 7 25326001 10 307768373641 11 3215031751 12 1502401849747176241 13 2152302898747 14 1478868544880821 15 3034679039109989281 17 3474749660383 18 ? 19 4498414682539051 20 ? 21 ? 22 16043083915816662841 23 341550071728321 CROSSREFS Cf. A089105. Sequence in context: A039917 A162140 A006945 * A173281 A004820 A320982 Adjacent sequences:  A089822 A089823 A089824 * A089826 A089827 A089828 KEYWORD nonn,hard,more AUTHOR N. J. A. Sloane, Jan 18 2004 EXTENSIONS a(8)-a(13) from Charles R Greathouse IV, Aug 14 2010 Corrected by Don Reble, May 27 2014 STATUS approved

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Last modified November 30 06:11 EST 2020. Contains 338781 sequences. (Running on oeis4.)