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Search: id:A128402
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| A128402 |
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Numbers n such that n^2 divides 22^n-1. |
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+0
15
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| 1, 3, 7, 21, 39, 273, 507, 3081, 3549, 21567, 40053, 78117, 280371
(list; graph; listen)
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OFFSET
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1,2
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MATHEMATICA
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a={}; Do[r=(22^n-1)/n^2; If[r==IntegerPart[r], AppendTo[a, n]], {n, 1, 10^3}]; a [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 07 2008]
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CROSSREFS
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Cf. A127103, A127104, A127105, A127106, A127107, A127102, A127101, A127100, A127092, A128405, A128393, A128394, A128395, A128396, A128397, A128398, A128399, A128400, A128401, A128403, A128404.
Sequence in context: A018572 A018641 A097162 this_sequence A018689 A119959 A018712
Adjacent sequences: A128399 A128400 A128401 this_sequence A128403 A128404 A128405
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KEYWORD
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more,nonn,less
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Mar 01 2007
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