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A115304 a(n) = if n<4 then n else 4*a(floor(n/4)) + 3 - n mod 4. 9
1, 2, 3, 7, 6, 5, 4, 11, 10, 9, 8, 15, 14, 13, 12, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 127, 126, 125, 124, 123, 122, 121 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Self-inverse permutation of the natural numbers;
A115310(n+2,3) = a(n);
if n is written in base 4 representation, then a(n) is the value after replacing all digits d (but not the leading one) by 3-d.
LINKS
CROSSREFS
Sequence in context: A069772 A277819 A098287 * A277901 A277902 A098285
KEYWORD
nonn,base
AUTHOR
Reinhard Zumkeller, Jan 20 2006
STATUS
approved

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Last modified March 28 14:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)