A081857 - OEIS

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A081857

Jacobsthal sequence (A001045) as represented in base 4.

0, 1, 1, 3, 11, 23, 111, 223, 1111, 2223, 11111, 22223, 111111, 222223, 1111111, 2222223, 11111111, 22222223, 111111111, 222222223, 1111111111, 2222222223, 11111111111, 22222222223, 111111111111, 222222222223, 1111111111111 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	LINKS	`Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.`
	FORMULA	`For n > 0, a(2n) is represented as a string of n 1's and a(2n+1) as a string of (n-1) 2's followed by a 3.`
	EXAMPLE	`a(8)= 1111 because A001045(8)= 85 (in base 10) = 64 + 16 + 4 + 1 = 1 * (4^3) + 1 * (4^2) + 1 * (4^1) + 1.`
	CROSSREFS	`Cf. A002450.` `Sequence in context: A158034 A002515 A096297 * A168163 A120088 A081737` `Adjacent sequences: A081854 A081855 A081856 * A081858 A081859 A081860`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Matthew Vandermast (ghodges14(AT)comcast.net), Apr 11 2003`

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.