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A128355
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Numbers k such that A122735(n) = n^k - k^n.
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1
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0, 5, 4, 0, 14, 7, 20, 11, 10, 273, 14, 13, 38, 89, 68, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| A122735(n) = {1, 7, 17, 1, 6102977801, 162287, 79792265017612001, ...} Smallest prime of the form (n^k - k^n) for k>1, or 1 if such prime does not exist. Currently a(n) is not known for n = {17,18,22,25,26,27,28,...}.
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CROSSREFS
| Cf. A122735.
Sequence in context: A193035 A021653 A020847 * A129522 A133842 A199453
Adjacent sequences: A128352 A128353 A128354 * A128356 A128357 A128358
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KEYWORD
| hard,more,nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Mar 05 2007
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