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A278999
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Numbers of the form (5h+2)*5^k-1 or (5h+3)*5^k-1 for h,k in N.
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2
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1, 2, 6, 7, 9, 11, 12, 14, 16, 17, 21, 22, 26, 27, 31, 32, 34, 36, 37, 39, 41, 42, 46, 47, 49, 51, 52, 56, 57, 59, 61, 62, 64, 66, 67, 71, 72, 74, 76, 77, 81, 82, 84, 86, 87, 89, 91, 92, 96, 97, 101, 102, 106, 107, 109, 111, 112, 114, 116, 117, 121, 122, 126, 127, 131
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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isok[n_]:=Module[{ord=IntegerExponent[n+1, 5]}, MemberQ[{2, 3}, Mod[(n+1)/5^ord, 5]]]; Select[Range[0, 131], isok] (*Ray Chandler, Dec 17 2016*)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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