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A177906
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Numbers k such that k^3 divides 6^(k^2) - 1.
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0
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1, 5, 1555, 9673655, 24181805, 90993505, 200928005, 28298980055, 36850702555, 62488609555, 141377087255, 150435008905, 367279622065, 2256331679135, 7521049172905, 18802586659555, 24599612913355, 54706615318945
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OFFSET
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1,2
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COMMENTS
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5 divides a(n) for n > 1.
Prime divisors of a(n) in order of their appearance are {5, 311, 6221, 15551, 18198701, 40185601, ...}.
From there on, the list is no longer increasing; it continues with 23698201, 90917741, 236192683, 93307, 311021, ... - M. F. Hasler, Oct 21 2012
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LINKS
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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