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A071249
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Numbers k such that gcd(k, R(k)) > 1, where R(k) (A004086) is the digit reversal of k.
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4
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2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 15, 18, 20, 21, 22, 24, 26, 27, 28, 30, 33, 36, 39, 40, 42, 44, 45, 46, 48, 50, 51, 54, 55, 57, 60, 62, 63, 64, 66, 68, 69, 70, 72, 75, 77, 78, 80, 81, 82, 84, 86, 87, 88, 90, 93, 96, 99, 101, 102, 105, 108, 110, 111, 114, 117, 120, 121
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OFFSET
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1,1
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COMMENTS
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LINKS
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MATHEMATICA
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Select[ Range[125], GCD[ #, FromDigits[ Reverse[ IntegerDigits[ # ]]]] > 1 & ]
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PROG
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(Haskell)
a071249 n = a071249_list !! (n-1)
a071249_list = filter ((> 1) . a055483) [1..]
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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Definition corrected by N. J. A. Sloane, Aug 27 2020 following a suggestion from José Hernández Santiago
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STATUS
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approved
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