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A089689
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a={1,3,7,9} a1={0,1,3,7,9} b[n]=Flatten[Table[10*Sum[10^m*a1[[1+Mod[n+m,5]]],{m,0,n}]+a,{n,0,digits}]] a(m) = If b[n] is prime then b[n]
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0
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3, 7, 311, 313, 317, 9733, 9739, 10973, 10979, 31097317, 73109731091, 97310973101, 97310973103, 97310973109733, 7310973109731091, 73109731097310973109731097, 97310973109731097310973101
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OFFSET
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1,1
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COMMENTS
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A sum method for producing a prime set based of two digits sets.
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LINKS
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Table of n, a(n) for n=1..17.
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MATHEMATICA
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a={1, 3, 7, 9} a1={0, 1, 3, 7, 9} digits=100 b=Flatten[Table[10*Sum[10^m*a1[[1+Mod[n+m, 5]]], {m, 0, n}]+a, {n, 0, digits}]]; c=Table[If[PrimeQ[b[[n]]]==True, b[[n]], 0], {n, 1, Dimensions[b][[1]]}] d=Delete[Union[c], 1]
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CROSSREFS
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Sequence in context: A088097 A064774 A348376 * A248701 A103317 A104051
Adjacent sequences: A089686 A089687 A089688 * A089690 A089691 A089692
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KEYWORD
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nonn,base,less,uned
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AUTHOR
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Roger L. Bagula, Jan 05 2004
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STATUS
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approved
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