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A003595
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Numbers of the form 5^i*7^j.
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11
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1, 5, 7, 25, 35, 49, 125, 175, 245, 343, 625, 875, 1225, 1715, 2401, 3125, 4375, 6125, 8575, 12005, 15625, 16807, 21875, 30625, 42875, 60025, 78125, 84035, 109375, 117649, 153125, 214375, 300125, 390625, 420175, 546875, 588245
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Successive k such that EulerPhi[35 k] = 24 k: 35*A003595(n)=A033851(n). [Artur Jasinski (grafix(AT)csl.pl), Nov 09 2008]
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MATHEMATICA
| a = {}; Do[If[EulerPhi[35 k] == 24 k, AppendTo[a, k]], {k, 1, 10000}]; a [From Artur Jasinski (grafix(AT)csl.pl), Nov 09 2008]
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PROG
| (PARI) list(lim)=my(v=List(), N); for(n=0, log(lim)\log(7), N=7^n; while(N<=lim, listput(v, N); N*=5)); vecsort(Vec(v)) \\ Charles R Greathouse IV, Jun 28 2011
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CROSSREFS
| A033851, A143207, A147571-A147575, A147576-A147580 [From Artur Jasinski (grafix(AT)csl.pl), Nov 09 2008]
Sequence in context: A072370 A057490 A057253 * A018697 A018319 A100095
Adjacent sequences: A003592 A003593 A003594 * A003596 A003597 A003598
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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