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A047438
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Numbers that are congruent to {1, 5, 6} mod 8.
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2
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1, 5, 6, 9, 13, 14, 17, 21, 22, 25, 29, 30, 33, 37, 38, 41, 45, 46, 49, 53, 54, 57, 61, 62, 65, 69, 70, 73, 77, 78, 81, 85, 86, 89, 93, 94, 97, 101, 102, 105, 109, 110, 113, 117, 118, 121, 125, 126, 129, 133, 134, 137, 141, 142, 145, 149, 150, 153, 157, 158
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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+4*x+x^2+2*x^3)/((1+x+x^2)*(x-1)^2). - R. J. Mathar, Dec 07 2011
a(n) = a(n-1) + a(n-3) - a(n-4) for n>4.
a(n) = 2*(12*n-6-3*cos(2*n*Pi/3)-2*sqrt(3)*sin(2*n*Pi/3))/9.
a(3k) = 8k-2, a(3k-1) = 8k-3, a(3k-2) = 8k-7. (End)
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MAPLE
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MATHEMATICA
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Select[Range[0, 150], MemberQ[{1, 5, 6}, Mod[#, 8]] &] (* Wesley Ivan Hurt, Jun 10 2016 *)
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PROG
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(Magma) [n : n in [0..150] | n mod 8 in [1, 5, 6]]; // Wesley Ivan Hurt, Jun 10 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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