id:A078274 - OEIS Search Results

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a(n) is the number from which if odd-positioned digits are deleted then one gets the concatenation of first n odd numbers, while if even-positioned digits are deleted then one gets reverse concatenation of first n odd numbers. Position of least significant digit is considered to be 1.

+0
4

11, 1331, 153351, 17355371, 1937557391, 11315977951311, 113351719917151331, 1135517391111917351351, 11375175911311113917551371, 113951779115111331115917751391, 1231517991171115311351117917952311 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(4) = 17355371: deleting alternate digits starting from the LSD gives 1357. Deleting the other digits gives 7531.`
	CROSSREFS	`Cf. A078275, A078276, A078277, A078278.` `Sequence in context: A015009 A068326 A001323 this_sequence A013716 A110195 A015484` `Adjacent sequences: A078271 A078272 A078273 this_sequence A078275 A078276 A078277`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 25 2002`
	EXTENSIONS	`More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 19 2003`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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