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A067947
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Numbers n such that n divides 7^n-1.
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5
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1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 20, 24, 27, 32, 36, 40, 48, 54, 57, 60, 64, 72, 80, 81, 96, 100, 108, 114, 120, 128, 144, 156, 160, 162, 171, 180, 192, 200, 216, 220, 228, 240, 243, 256, 258, 272, 288, 300, 312, 320, 324, 333, 342, 360, 384, 400, 432, 440, 456
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| If k>=0 2^k is in the sequence.
3^k is in the sequence. k! is in the sequence for k<7. k!/7 is in the sequence for 7<=k<14. k!/7^2 is in the sequence for 14<=k<21. k!/7^3 is in the sequence for 21<=k<28. k!/7^4 is in the sequence for k = 28. Numbers n such that n^2 divides 7^n-1 are listed in A127107(n) = {1,2,3,4,6,8,12,20,24,40,57,60,100,114,120,156,200,...}. - Alexander Adamchuk (alex(AT)kolmogorov.com), Jan 05 2007
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CROSSREFS
| Cf. A127107 = numbers n such that n^2 divides 7^n-1.
Sequence in context: A010434 A074230 A064438 * A053640 A097755 A083854
Adjacent sequences: A067944 A067945 A067946 * A067948 A067949 A067950
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KEYWORD
| easy,nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 05 2002
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