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A097585
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Binary representation of n if n is prime, otherwise the ternary representation of n.
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0
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1, 10, 11, 11, 101, 20, 111, 22, 100, 101, 1011, 110, 1101, 112, 120, 121, 10001, 200, 10011, 202, 210, 211, 10111, 220, 221, 222, 1000, 1001, 11101, 1010, 11111, 1012, 1020, 1021, 1022, 1100, 100101, 1102, 1110, 1111, 101001, 1120, 101011, 1122, 1200
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OFFSET
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1,2
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LINKS
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EXAMPLE
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For n = 7 we have 111 or 7 in base 2. For 8 we have 22 which is 8 in base 3.
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MATHEMATICA
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Table[If[PrimeQ[n], FromDigits[IntegerDigits[n, 2]], FromDigits[ IntegerDigits[ n, 3]]], {n, 50}] (* Harvey P. Dale, Apr 19 2015 *)
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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