A020338 - OEIS

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A020338

Doublets: base 10 representation is the juxtaposition of two identical strings.

11, 22, 33, 44, 55, 66, 77, 88, 99, 1010, 1111, 1212, 1313, 1414, 1515, 1616, 1717, 1818, 1919, 2020, 2121, 2222, 2323, 2424, 2525, 2626, 2727, 2828, 2929, 3030, 3131, 3232, 3333, 3434, 3535, 3636, 3737, 3838, 3939, 4040, 4141, 4242, 4343, 4444, 4545, 4646 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..9999`
	FORMULA	`a(n) = n*10^(A004216(n)+1) + n. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 11 2007`
	CROSSREFS	`Sequence in context: A083852 A056524 A110745 * A052191 A110732 A044836` `Adjacent sequences: A020335 A020336 A020337 * A020339 A020340 A020341`
	KEYWORD	`nonn,base`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.