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A125949
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Numbers n such that n divides 5^n - 4.
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1
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OFFSET
| 1,2
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COMMENTS
| Numbers n such that n divides 5^n + 4 are listed in A123047.
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MAPLE
| a(1) = 1; Do[ If[ PowerMod[5, 2n - 1, 2n - 1] - 4 == 0, Print[2n - 1]], {n, 10^9}]
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CROSSREFS
| Cf. A067946, A015951, A123047, A123091, A015891, A123061, A123052, A124246, A123062.
Sequence in context: A031657 A031567 A031747 * A204727 A203546 A189183
Adjacent sequences: A125946 A125947 A125948 * A125950 A125951 A125952
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KEYWORD
| hard,more,nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Feb 04 2007
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EXTENSIONS
| Two more terms from Max Alekseyev (maxale(AT)gmail.com), Jun 09 2010
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