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A068822
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a(n) = gcd(n,c(n)), where c(n) is the 10's complement of n.
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4
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1, 2, 1, 2, 5, 2, 1, 2, 1, 10, 1, 4, 1, 2, 5, 4, 1, 2, 1, 20, 1, 2, 1, 4, 25, 2, 1, 4, 1, 10, 1, 4, 1, 2, 5, 4, 1, 2, 1, 20, 1, 2, 1, 4, 5, 2, 1, 4, 1, 50, 1, 4, 1, 2, 5, 4, 1, 2, 1, 20, 1, 2, 1, 4, 5, 2, 1, 4, 1, 10, 1, 4, 1, 2, 25, 4, 1, 2, 1, 20, 1, 2
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OFFSET
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1,2
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LINKS
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FORMULA
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EXAMPLE
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a(45) = 5 as 10's complement of 45 is 100-45 = 55 and (45,55) = 5.
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MAPLE
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a:=n-> igcd((10^length(n)-n), n):
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MATHEMATICA
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GCD[#, 10^(IntegerLength[#]) - #] & /@ Range[82] (* Jayanta Basu, Aug 07 2013 *)
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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STATUS
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approved
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