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A128358
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Numbers n such that n divides 18^n - 1.
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10
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1, 17, 289, 4913, 83521, 1419857, 5846759, 24054337, 24137569, 99394903, 408923729, 410338673, 1689713351, 6951703393, 6975757441, 28725126967, 118178957681, 118285781329, 118587876497, 486643291847, 488327158439
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| 17 divides a(n) for n>1. a(n) = 17^(n-1) for n<7. a(7) = 20231*17^2.
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CROSSREFS
| Cf. A001026 = Powers of 17. Cf. A015969 = numbers n such that n | 16^n + 1.
Sequence in context: A045607 A045606 A171291 * A015969 A001026 A178765
Adjacent sequences: A128355 A128356 A128357 * A128359 A128360 A128361
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KEYWORD
| hard,nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Mar 01 2007
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EXTENSIONS
| a(8)-a(10) from Farideh Firoozbakht, Mar 05 2007
More terms from Ryan Propper (rpropper(AT)cs.stanford.edu), Dec 31 2007
a(20)-a(24) from Alexander Adamchuk (alex(AT)kolmogorov.com), May 17 2010
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