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A064080
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Zsigmondy numbers for a = 4, b = 1: Zs(n, 4, 1) is the greatest divisor of 4^n - 1^n (A024036) that is relatively prime to 4^m - 1^m for all positive integers m < n.
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11
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3, 5, 7, 17, 341, 13, 5461, 257, 1387, 41, 1398101, 241, 22369621, 3277, 49981, 65537, 5726623061, 4033, 91625968981, 61681, 1826203, 838861, 23456248059221, 65281, 1100586419201, 13421773, 22906579627, 15790321, 96076792050570581
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OFFSET
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1,1
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COMMENTS
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By Zsigmondy's theorem, the n-th Zsigmondy number for bases a and b is not 1 except in the three cases (1) a = 2, b = 1, n = 1, (2) a = 2, b = 1, n = 6, (3) n = 2 and a+b is a power of 2.
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LINKS
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Table of n, a(n) for n=1..29.
K. Zsigmondy, Zur Theorie der Potenzreste, Monatshefte für Mathematik und Physik, 3 (1892) 265-284.
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CROSSREFS
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Cf. A024036, A064078, A064079, A064081, A064082, A064083.
Sequence in context: A270779 A248796 A247164 * A184875 A112986 A052333
Adjacent sequences: A064077 A064078 A064079 * A064081 A064082 A064083
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KEYWORD
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nonn
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AUTHOR
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Jens Voß, Sep 04 2001
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EXTENSIONS
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Corrected and extended by Vladeta Jovovic, Sep 05 2001
Definition corrected by Jerry Metzger, Nov 04 2009
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STATUS
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approved
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