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Search: id:A127092
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| A127092 |
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Numbers n such that n^2 divides 11^n-1. |
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24
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| 1, 2, 4, 5, 6, 10, 12, 20, 30, 42, 60, 84, 114, 156, 210, 222, 228, 244, 420, 444, 570, 732, 780, 798, 930, 1092, 1110, 1140, 1220, 1554, 1596, 1806, 1860, 2220, 2436, 2964, 3108, 3612, 3660, 3990, 4218, 5124, 5460, 5772, 6510, 7770, 7980, 8268, 8436, 9030
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OFFSET
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1,2
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COMMENT
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a(n) is a subset of A068383(n) = {1, 2, 4, 5, 6, 8, 10, 12, 16, 18, 20, 24, 25, 30, 32, 36, 40, 42, ...} Numbers n such that n divides 11^n-1.
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MATHEMATICA
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Select[Range[15000], IntegerQ[(PowerMod[11, #, #^2 ]-1)/#^2 ]&]
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CROSSREFS
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Cf. A127100, A127101, A127102, A127104, A123105, A127106, A127107. Cf. A068383 = numbers n such that n divides 11^n-1.
Sequence in context: A029513 A061949 A128167 this_sequence A128171 A039036 A043045
Adjacent sequences: A127089 A127090 A127091 this_sequence A127093 A127094 A127095
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KEYWORD
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nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Jan 05 2007
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