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A097585 Binary representation of n if n is prime, otherwise the ternary representation of n. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
For n = 7 we have 111 or 7 in base 2. For 8 we have 22 which is 8 in base 3.
MATHEMATICA
Table[If[PrimeQ[n], FromDigits[IntegerDigits[n, 2]], FromDigits[ IntegerDigits[ n, 3]]], {n, 50}] (* Harvey P. Dale, Apr 19 2015 *)
CROSSREFS
Sequence in context: A045988 A008947 A108787 * A063671 A330024 A184992
KEYWORD
base,nonn
AUTHOR
Cino Hilliard, Aug 29 2004
STATUS
approved

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Last modified February 29 17:23 EST 2024. Contains 370427 sequences. (Running on oeis4.)