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A119905 Numbers n such that (n,R_n)=1, where R_n=(10^n -1)/9=A002275(n). 2

%I

%S 1,2,4,5,7,8,10,11,13,14,16,17,19,20,23,25,26,28,29,31,32,34,35,37,38,

%T 40,41,43,46,47,49,50,52,53,55,56,58,59,61,62,64,65,67,68,70,71,73,74,

%U 76,77,79,80,82,83,85,86,89,91,92,94,95,97,98,100,101,103,104,106,107

%N Numbers n such that (n,R_n)=1, where R_n=(10^n -1)/9=A002275(n).

%H T. D. Noe, <a href="/A119905/b119905.txt">Table of n, a(n) for n=1..1000</a>

%t Select[Range[1000], GCD[#, (10^# - 1)/9] == 1&] (* _Jean-Fran├žois Alcover_, May 19 2016 *)

%Y Cf. A119888.

%K nice,nonn

%O 1,2

%A _Lekraj Beedassy_, Aug 03 2006

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Last modified October 20 07:33 EDT 2019. Contains 328252 sequences. (Running on oeis4.)