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A163505
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a(n) = n-th odd nonprime mod n-th odd number.
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1
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0, 0, 0, 0, 7, 5, 7, 5, 5, 7, 7, 5, 5, 3, 5, 3, 3, 5, 3, 3, 3, 1, 1, 46, 46, 48, 52, 1, 1, 58, 58, 58, 58, 58, 60, 62, 62, 66, 66, 66, 66, 70, 70, 72, 72, 74, 76, 76, 78, 78, 82, 82, 82, 82, 86, 90, 90, 90, 90, 90, 92, 92, 92, 92, 92, 94, 98, 100, 100, 104, 104, 104, 104, 106, 106
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OFFSET
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1,5
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LINKS
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FORMULA
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EXAMPLE
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a(1)= 1 mod 1 =0. a(2) = 9 mod 3 =0. a(3) = 15 mod 5 =0. a(4)= 21 mod 7 =0. a(5)=(25 mod 9)=7.
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MAPLE
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A014076 := proc(n) option remember; local a; if n = 1 then 1; else for a from procname(n-1)+2 by 2 do if not isprime(a) then return a; end if; end do: end if; end proc:
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MATHEMATICA
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A014076 := Select[Range[1, 10000, 2], PrimeOmega[#] != 1 &]; Table[Mod[A014076[[n]], 2*n - 1], {n, 1, 50}] (* G. C. Greubel, Jul 27 2017 *)
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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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Missing term between a(53) and a(54) inserted by G. C. Greubel, Jul 27 2017
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STATUS
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approved
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