id:A078278 - 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 prime numbers, while if even-positioned digits are deleted then one gets reverse concatenation of first n prime numbers. Position of least significant digit is considered to be 1.

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22, 2332, 253352, 27355372, 213157751312, 2133517117151332, 21375173111117351372, 213951771113113117751392, 2233517911171133117117952332, 22395273111911371173119127352392 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(4) = 27355372: deleting alternate digits starting from the LSD leaves 2357. Deleting the other ones leaves 7532.`
	CROSSREFS	`Cf. A078279, A078280, A078281.` `Sequence in context: A069222 A117990 A098130 this_sequence A078275 A128854 A114942` `Adjacent sequences: A078275 A078276 A078277 this_sequence A078279 A078280 A078281`
	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 August 29 17:54 EDT 2008. Contains 143238 sequences.

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