id:A117640 - OEIS Search Results

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Concatenation of first n numbers in base 4.

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1, 12, 123, 12310, 1231011, 123101112, 12310111213, 1231011121320, 123101112132021, 12310111213202122, 1231011121320212223, 123101112132021222330, 12310111213202122233031 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Quaternary analogue of A047778 Concatenation of first n numbers in binary. See also A054635 Champernowne sequence: write n in base 3 and juxtapose.`
	FORMULA	`a(n) = a(n-1)*4^(1+floor[log4(n)])+n.`
	CROSSREFS	`Cf. A047778, A054635.` `Sequence in context: A141266 A083429 A077306 this_sequence A074158 A071269 A061088` `Adjacent sequences: A117637 A117638 A117639 this_sequence A117641 A117642 A117643`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Jonathan Vos Post (jvospost3(AT)gmail.com), Apr 27 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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