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A119905 Numbers n such that (n,R_n)=1, where R_n=(10^n -1)/9=A002275(n). 2
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, 40, 41, 43, 46, 47, 49, 50, 52, 53, 55, 56, 58, 59, 61, 62, 64, 65, 67, 68, 70, 71, 73, 74, 76, 77, 79, 80, 82, 83, 85, 86, 89, 91, 92, 94, 95, 97, 98, 100, 101, 103, 104, 106, 107 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

T. D. Noe, Table of n, a(n) for n=1..1000

MATHEMATICA

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

CROSSREFS

Cf. A119888.

Sequence in context: A248607 A191266 A003253 * A213219 A161750 A249400

Adjacent sequences:  A119902 A119903 A119904 * A119906 A119907 A119908

KEYWORD

nice,nonn

AUTHOR

Lekraj Beedassy, Aug 03 2006

STATUS

approved

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Last modified February 24 03:21 EST 2018. Contains 299595 sequences. (Running on oeis4.)