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A090094
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a(n) is the smallest composite number coprime to n, n+1, n+2, n+3 and n+4.
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3
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49, 49, 121, 121, 121, 121, 169, 49, 49, 289, 289, 121, 121, 121, 49, 49, 121, 169, 169, 169, 169, 49, 49, 121, 121, 121, 121, 121, 49, 49, 169, 169, 169, 121, 121, 49, 49, 121, 121, 169, 169, 169, 49, 49, 121, 121, 121, 121, 121, 49, 49, 289, 169, 169, 169, 121, 49
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OFFSET
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1,1
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LINKS
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FORMULA
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MATHEMATICA
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m=0; Table[fla=1; Do[s=GCD[n, k]; s1=GCD[n, k+1]; s2=GCD[n, k+2]; s3=GCD[n, k+3]; s4=GCD[n, k+4]; s5=GCD[n, k+5]; If[Equal[s, 1]&&Equal[s1, 1]&&Equal[s2, 1]&&Equal[s3, 1]&& Equal[s4, 1]&&!PrimeQ[n]&&!Equal[n, 1]&&Equal[fla, 1], m=m+1; Print[n]; fla=0], {n, 1, 1000}], {k, 1, 256}]
scn[n_]:=Module[{cn=4}, While[!CompositeQ[cn]||!And@@CoprimeQ[ Range[ n, n+4], cn], cn++]; cn]; Array[scn, 60] (* Harvey P. Dale, Aug 12 2014 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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