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Search: id:A033850
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| A033850 |
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Numbers n whose prime factors are 3 and 7. |
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+0
1
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| 21, 63, 147, 189, 441, 567, 1029, 1323, 1701, 3087, 3969, 5103, 7203, 9261, 11907, 15309, 21609, 27783, 35721, 45927, 50421, 64827, 83349, 107163, 137781, 151263, 194481, 250047, 321489, 352947, 413343, 453789, 583443, 750141, 964467
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Also, numbers n such that phi(n)/n = 4/7, where phi is the Euler totient function A000010. - Lekraj Beedassy (blekraj(AT)yahoo.com), Jul 18 2008
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REFERENCES
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J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 189, p. 57, Ellipses, Paris 2008.
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CROSSREFS
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Sequence in context: A143203 A082060 A025525 this_sequence A113622 A069215 A115921
Adjacent sequences: A033847 A033848 A033849 this_sequence A033851 A033852 A033853
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KEYWORD
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nonn
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AUTHOR
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Jeff Burch (gburch(AT)erols.com)
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