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A103127
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Numbers congruent to {-1, 1, 3, 5} mod 16.
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4
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1, 3, 5, 15, 17, 19, 21, 31, 33, 35, 37, 47, 49, 51, 53, 63, 65, 67, 69, 79, 81, 83, 85, 95, 97, 99, 101, 111, 113, 115, 117, 127, 129, 131, 133, 143, 145, 147, 149, 159, 161, 163, 165, 175, 177, 179, 181, 191, 193, 195, 197, 207, 209, 211, 213, 223, 225, 227, 229, 239, 241
(list;
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refs;
listen;
history;
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internal format)
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OFFSET
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1,2
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COMMENTS
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LINKS
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David Applegate, Benoit Cloitre, Philippe Deléham and N. J. A. Sloane, Sloping binary numbers: a new sequence related to the binary numbers, J. Integer Seq. 8 (2005), no. 3, Article 05.3.6, 15 pp [pdf, ps].
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FORMULA
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O.g.f.: x*(1 + 2*x + 2*x^2 + 10*x^3 + x^4)/((1 - x)^2*(1 + x)*(1 + x^2)).
a(n) = a(n-4) + 16. (End)
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MATHEMATICA
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Select[Range[300], MemberQ[{1, 3, 5, 15}, Mod[#, 16]]&] (* Harvey P. Dale, Aug 10 2019 *)
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PROG
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(Haskell)
a103127 n = a103127_list !! (n-1)
a103127_list = [x | x <- [1..], x `mod` 16 `elem` [1, 3, 5, 15]]
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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