id:A020338 - OEIS Search Results

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A020338

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

+0
18

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; listen)

	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 this_sequence A052191 A110732 A044836` `Adjacent sequences: A020335 A020336 A020337 this_sequence A020339 A020340 A020341`
	KEYWORD	`nonn,base`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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