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Search: id:A125949
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| A125949 |
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Numbers n such that n divides 5^n - 4. |
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+0
1
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OFFSET
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1,2
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COMMENT
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Numbers n such that n divides 5^n + 4 are listed in A123047 = {1, 3, 129, 60767, 76433163, 454034821, ...}.
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MAPLE
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a(1) = 1; Do[ If[ PowerMod[5, 2n - 1, 2n - 1] - 4 == 0, Print[2n - 1]], {n, 10^9}]
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CROSSREFS
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Cf. A067946 = numbers n such that n divides 5^n-1. Cf. A015951 = numbers n such that n | 5^n + 1. Cf. A123047, A123091, A015891, A123061, A123052, A124246, A123062.
Sequence in context: A031657 A031567 A031747 this_sequence A138087 A096517 A096790
Adjacent sequences: A125946 A125947 A125948 this_sequence A125950 A125951 A125952
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KEYWORD
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bref,hard,more,nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Feb 04 2007
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