id:A038555 - OEIS Search Results

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Derivative of n in base 3.

+0
1

0, 0, 0, 1, 2, 0, 2, 0, 1, 3, 4, 5, 7, 8, 6, 2, 0, 1, 6, 7, 8, 1, 2, 0, 5, 3, 4, 9, 10, 11, 13, 14, 12, 17, 15, 16, 21, 22, 23, 25, 26, 24, 20, 18, 19, 6, 7, 8, 1, 2, 0, 5, 3, 4, 18, 19, 20, 22, 23, 21, 26, 24, 25, 3, 4, 5, 7, 8, 6, 2, 0, 1, 15, 16, 17, 10, 11, 9, 14, 12, 13, 27, 28, 29 (list; graph; listen)

	OFFSET	`0,5`
	FORMULA	`Write n in ternary, replace each digit by sum of its 2 neighbors.`
	EXAMPLE	`15 = 120 in ternary, derivative is 02 = 2, so a(15)=2.`
	CROSSREFS	`Cf. A038554.` `Sequence in context: A105783 A022879 A064984 this_sequence A138108 A158777 A039970` `Adjacent sequences: A038552 A038553 A038554 this_sequence A038556 A038557 A038558`
	KEYWORD	`nonn,nice,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`More terms from Erich Friedman (erich.friedman(AT)stetson.edu).`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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