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A127105
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Numbers n such that n^2 divides 5^n-1.
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23
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1, 2, 4, 6, 12, 42, 52, 84, 156, 186, 372, 1092, 1218, 1302, 1806, 2436, 2604, 2756, 3612, 4836, 5334, 7212, 8268, 10668, 12324, 15918, 18858, 24492, 31668, 31836, 33852, 37716, 37758, 46956, 50484, 52374, 55986, 57876, 71862, 75516, 86268
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| a(n) is a subset of A067946(n) = {1, 2, 4, 6, 8, 12, 16, 18, 24, 32, 36, 42, 48, 52, 54, 64, 72, 84, 96, ...} Numbers n such that n divides 5^n-1.
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MATHEMATICA
| Select[Range[30000], IntegerQ[(PowerMod[5, #, #^2 ]-1)/#^2 ]&]
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CROSSREFS
| Cf. A127100, A127101, A127102, A127103, A123104, A127106, A127107, A127092. Cf. A067946 = numbers n such that n divides 5^n-1.
Sequence in context: A087902 A180213 A081457 * A196444 A110980 A058598
Adjacent sequences: A127102 A127103 A127104 * A127106 A127107 A127108
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KEYWORD
| nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Jan 05 2007
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EXTENSIONS
| More terms from Ryan Propper (rpropper(AT)stanford.edu) and Alexander Adamchuk (alex(AT)kolmogorov.com), Jan 05 2007
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