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Search: id:A089685
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| A089685 |
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a={1,3,7,9} p[n]=Prime[n]*10+a[[1+Mod[n,4]]] a(m) = if p[n] is prime, then p[n] |
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| 23, 37, 59, 71, 113, 137, 179, 191, 233, 479, 593, 617, 733, 797, 839, 1039, 1093, 1279, 1373, 1499, 1511, 1637, 1931, 1973, 1997, 2273, 2297, 2339, 2579, 2693, 2833, 3079, 3319, 3371, 3539, 3673, 4019, 4091, 4217, 4637, 4679, 4999, 5639, 5879, 6079, 6131
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A prime generator function based on the primes and the digit set {1,3,7,9}.
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MATHEMATICA
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a={1, 3, 7, 9} digits=3*200 b=Table[Prime[n]*10+a[[1+Mod[n, 4]]], {n, 1, digits}] c=Table[If[PrimeQ[b[[n]]]==True, b[[n]], 0], {n, 1, digits}] d=Delete[Union[c], 1]
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CROSSREFS
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Sequence in context: A124888 A141521 A080906 this_sequence A068016 A140442 A078731
Adjacent sequences: A089682 A089683 A089684 this_sequence A089686 A089687 A089688
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KEYWORD
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nonn
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jan 05 2004
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