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A176598
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Numbers n such that phi(n)/n = 16/41.
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1
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410, 820, 1640, 2050, 3280, 4100, 6560, 8200, 10250, 13120, 16400, 16810, 20500, 26240, 32800, 33620, 41000, 51250, 52480, 65600, 67240, 82000, 84050, 102500, 104960, 131200, 134480, 164000, 168100, 205000, 209920, 256250, 262400, 268960, 328000, 336200
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OFFSET
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1,1
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COMMENTS
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Phi(.)= A000010(.) is the Euler totient function.
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REFERENCES
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J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 410, p. 91, Ellipses, Paris 2008.
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LINKS
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FORMULA
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EXAMPLE
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For n = 410, phi(410)/410 = 160/410 = 16/41, which puts 410 into the sequence.
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MAPLE
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with(numtheory): ii:=1: N0:=40: tabl:=array(1..N0+1): for n from 1 to 540000 do : if 41*phi(n)=16*n then tabl[ii]:= n: ii:= ii+1: fi: od: print(tabl):
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Link to b-file of another sequence removed - R. J. Mathar, Oct 20 2010
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STATUS
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approved
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