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A047427
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Numbers that are congruent to {1, 3, 4, 5, 6} mod 8.
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1
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1, 3, 4, 5, 6, 9, 11, 12, 13, 14, 17, 19, 20, 21, 22, 25, 27, 28, 29, 30, 33, 35, 36, 37, 38, 41, 43, 44, 45, 46, 49, 51, 52, 53, 54, 57, 59, 60, 61, 62, 65, 67, 68, 69, 70, 73, 75, 76, 77, 78, 81, 83, 84, 85, 86, 89, 91, 92, 93, 94, 97, 99, 100, 101, 102
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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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G.f.: x*(1+2*x+x^2+x^3+x^4+2*x^5) / ( (x^4+x^3+x^2+x+1)*(x-1)^2 ). - R. J. Mathar, Oct 08 2011
a(n) = a(n-1) + a(n-5) - a(n-6) for n > 6, a(n) = a(n-5) + 8 for n > 5.
a(n) = (40*n - 25 + 3*(n mod 5) + 3*((n+1) mod 5) + 3*((n+2) mod 5) - 2*((n+3) mod 5) - 7*((n+4) mod 5))/25.
a(5k) = 8k-2, a(5k-1) = 8k-3, a(5k-2) = 8k-4, a(5k-3) = 8k-5, a(5k-4) = 8k-7. (End)
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MAPLE
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MATHEMATICA
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Select[Range[0, 100], MemberQ[{1, 3, 4, 5, 6}, Mod[#, 8]] &] (* Wesley Ivan Hurt, Aug 01 2016 *)
LinearRecurrence[{1, 0, 0, 0, 1, -1}, {1, 3, 4, 5, 6, 9}, 70] (* Harvey P. Dale, Dec 15 2018 *)
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PROG
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(Magma) [n : n in [0..150] | n mod 8 in [1, 3, 4, 5, 6]]; // Wesley Ivan Hurt, Aug 01 2016
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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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