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A055949
n - reversal of base 4 digits of n (written in base 10).
1
0, 0, 0, 0, 3, 0, -3, -6, 6, 3, 0, -3, 9, 6, 3, 0, 15, 0, -15, -30, 15, 0, -15, -30, 15, 0, -15, -30, 15, 0, -15, -30, 30, 15, 0, -15, 30, 15, 0, -15, 30, 15, 0, -15, 30, 15, 0, -15, 45, 30, 15, 0, 45, 30, 15, 0, 45, 30, 15, 0, 45, 30, 15, 0, 63, 0, -63, -126, 51, -12, -75, -138, 39, -24, -87, -150, 27, -36, -99, -162, 75, 12, -51
OFFSET
0,5
COMMENTS
a(n) is a multiple of 3.
LINKS
FORMULA
a(n) = n - A030103(n).
EXAMPLE
For n = 6, the reversal of base 4 digits of n (written in base 10) is 9. So, a(6) = 6 - 9 = -3. - Indranil Ghosh, Feb 01 2017
MATHEMATICA
Table[n-FromDigits[Reverse[IntegerDigits[n, 4]], 4], {n, 0, 90}] (* Harvey P. Dale, Aug 22 2011 *)
CROSSREFS
Sequence in context: A010599 A226568 A038517 * A165012 A198126 A074694
KEYWORD
base,sign
AUTHOR
Henry Bottomley, Jul 18 2000
STATUS
approved