id:A078279 - 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 composite numbers, while if even-positioned digits are deleted then one gets reverse concatenation of first n composite numbers. Position of least significant digit is considered to be 1.

+0
4

44, 4664, 486684, 49688694, 416089981604, 4162819019081624, 41648192110019281644, 416581941102112019481654, 4166819511041122114019581664, 41688196110511241142115019681684 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(4) = 49688694: deleting alternate digits starting from the LSD leaves 4689. Deleting the other ones leaves 9864.`
	CROSSREFS	`Cf. A078278, A078280, A078281.` `Sequence in context: A041925 A094506 A121008 this_sequence A007105 A119096 A131484` `Adjacent sequences: A078276 A078277 A078278 this_sequence A078280 A078281 A078282`
	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 8 08:31 EST 2009. Contains 170430 sequences.

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