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Search: id:A033851
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| A033851 |
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Numbers n whose prime factors are 5 and 7. |
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+0
2
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| 35, 175, 245, 875, 1225, 1715, 4375, 6125, 8575, 12005, 21875, 30625, 42875, 60025, 84035, 109375, 153125, 214375, 300125, 420175, 546875, 588245, 765625, 1071875, 1500625, 2100875, 2734375, 2941225, 3828125, 4117715, 5359375, 7503125
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Contribution from Artur Jasinski (grafix(AT)csl.pl), Nov 09 2008: (Start)
Successive k such that EulerPhi[k]/k == 24/35.
a(n)=35*A003595(n) (End)
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MATHEMATICA
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a = {}; Do[If[EulerPhi[x]/x == 24/35, AppendTo[a, x]], {x, 1, 10000}]; a [From Artur Jasinski (grafix(AT)csl.pl), Nov 09 2008]
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CROSSREFS
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A003595, A147571-A147575, A147576-A147580 [From Artur Jasinski (grafix(AT)csl.pl), Nov 09 2008]
Sequence in context: A045614 A154074 A015219 this_sequence A101954 A005937 A007329
Adjacent sequences: A033848 A033849 A033850 this_sequence A033852 A033853 A033854
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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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