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A201462
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Numbers that are not coprime to their 9's complement.
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2
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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
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OFFSET
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1,1
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COMMENTS
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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.
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LINKS
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EXAMPLE
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22 is in the sequence because its 9's complement is 77 and gcd(22, 77) = 11 > 1.
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MATHEMATICA
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(* First run the program for A061601 to define nineComplement *) Select[Range[200], GCD[#, nineComplement[#]] > 1 &]
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PROG
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(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]
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CROSSREFS
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KEYWORD
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nonn,easy,base
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AUTHOR
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STATUS
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approved
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