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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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1
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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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Table of n, a(n) for n=1..57.
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FORMULA
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a(n)=A053673[n]^2
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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}]
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CROSSREFS
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Cf. A053669-A053674, A090090-A090095.
Sequence in context: A033369 A027647 A221202 * A198435 A165870 A050709
Adjacent sequences: A090091 A090092 A090093 * A090095 A090096 A090097
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Nov 26 2003
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STATUS
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approved
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