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A139768
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Numbers n such that (10^(n+1) mod 9^(n+1))/(10^n mod 9^n)=10, or A139739(n+1)/A139739(n)=10.
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2
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21, 38, 57, 58, 71, 81, 127, 148, 164, 181, 188, 195, 204, 208, 209, 212, 232, 244, 249, 250, 251, 252, 267, 269, 270, 300, 317, 326, 356, 357, 382, 398, 407, 409, 416, 417, 420, 447, 448, 453, 471, 479, 480, 481, 492, 502, 505, 528, 530, 548, 554, 561, 570
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OFFSET
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1,1
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COMMENTS
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Also, this is the set of numbers n such that 9*floor((10/9)^(n+1))==10*floor((10/9)^n) (cf. A065566). For proof see Mathar link.
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LINKS
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MAPLE
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Res:= NULL: count:= 0:
v:= 1:
for n from 2 while count < 100 do
u:= floor((10/9)^n);
if 9*u = 10*v then count:= count+1; Res:= Res, n-1 fi;
v:= u;
od:
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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