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 A201462 Numbers that are not coprime to their 9's complement. 2
 3, 6, 9, 11, 12, 15, 18, 21, 22, 24, 27, 30, 33, 36, 39, 42, 44, 45, 48, 51, 54, 55, 57, 60, 63, 66, 69, 72, 75, 77, 78, 81, 84, 87, 88, 90, 93, 96, 99, 102, 105, 108, 111, 114, 117, 120, 123, 126, 129, 132, 135, 138, 141, 144, 147, 148, 150, 153, 156, 159 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All multiples of 3 are in this sequence. Multiples of 11 are in this sequence if they have an even number of digits or if they are also multiples of 3. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 EXAMPLE 22 is in the sequence because its 9's complement is 77 and gcd(22, 77) = 11 > 1. MATHEMATICA (* First run the program for A061601 to define nineComplement *) Select[Range[200], GCD[#, nineComplement[#]] > 1 &] PROG (MAGMA) [n: n in [3..159] | Gcd(10^#Intseq(n)-1, n) gt 1]; // Bruno Berselli, Dec 02 2011 (Haskell) a201462 n = a201462_list !! (n-1) a201462_list = [x | x <- [1..], gcd x (a061601 x) > 1] -- Reinhard Zumkeller, Dec 03 2011 CROSSREFS Cf. A061601 (9's complement of n), A192817 (complement). Sequence in context: A153238 A343112 A230193 * A189302 A086883 A154777 Adjacent sequences:  A201459 A201460 A201461 * A201463 A201464 A201465 KEYWORD nonn,easy,base AUTHOR Alonso del Arte, Dec 01 2011 STATUS approved

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Last modified June 22 21:29 EDT 2021. Contains 345393 sequences. (Running on oeis4.)