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A284964
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Numbers with digits 3 and 9 only.
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1
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3, 9, 33, 39, 93, 99, 333, 339, 393, 399, 933, 939, 993, 999, 3333, 3339, 3393, 3399, 3933, 3939, 3993, 3999, 9333, 9339, 9393, 9399, 9933, 9939, 9993, 9999, 33333, 33339, 33393, 33399, 33933, 33939, 33993, 33999, 39333, 39339, 39393, 39399, 39933, 39939
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OFFSET
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1,1
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COMMENTS
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All terms > 3 are composite.
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LINKS
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FORMULA
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MATHEMATICA
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Table[FromDigits/@Tuples[{3, 9}, n], {n, 5}]//Flatten (* Harvey P. Dale, Sep 20 2022 *)
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PROG
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(Magma) [n: n in [1..100000] | Set(IntegerToSequence(n, 10)) subset {3, 9}]
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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