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Write n in base 3, then (working from left to right) if the k-th digit of n is equal to the corresponding digit to the left of the k-th digit of a(n) then 1 is the k-th digit of a(n), otherwise the k-th digit of a(n) is 0, then read result as a base 2 number.

+0
3

0, 1, 1, 3, 2, 3, 3, 3, 2, 6, 7, 7, 5, 4, 5, 7, 7, 6, 6, 7, 7, 7, 6, 7, 5, 5, 4, 12, 13, 13, 15, 14, 15, 15, 15, 14, 10, 11, 11, 9, 8, 9, 11, 11, 10, 14, 15, 15, 15, 14, 15, 13, 13, 12, 12, 13, 13, 15, 14, 15, 15, 15, 14, 14, 15, 15, 13, 12, 13, 15, 15, 14, 10, 11, 11, 11, 10, 11, 9, 9 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`A ternary to binary switch.`
	FORMULA	`a(n) = 2a([n/3])+A060584(n) = A060586(A060587(n)).`
	EXAMPLE	`a(76) = 10 since 76 written in base 3 is 2211, and looking for changing digits produces 1010 which read as if in binary is 10.`
	CROSSREFS	`k appears A001316(k) times in the sequence.` `Sequence in context: A054263 A124874 A016459 this_sequence A114451 A080428 A120004` `Adjacent sequences: A060582 A060583 A060584 this_sequence A060586 A060587 A060588`
	KEYWORD	`base,nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Apr 04 2001`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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