A123179 - OEIS

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A123179

a(1)=1 a(2)=121 and a(n)=a(n-1) n 2 n 3 n ... n (n-1) n 1, using concatenation.

1, 121, 1213231, 1213231424341, 121323142434152535451, 1213231424341525354516263646561, 1213231424341525354516263646561727374757671 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`An example of transition complete sequences, when n <= 9. One needs to consider the base 10 complications when n >= 10. The number of digits is given by d(n)=d(n-1)+2n-2 which is A002061.`
	EXAMPLE	`a(4)=1213231424341=1213231 + 4 2 4 3 4 1.`
	CROSSREFS	`Cf. A108713, A002061.` `Sequence in context: A178192 A135825 A082215 * A136094 A053885 A068490` `Adjacent sequences: A123176 A123177 A123178 * A123180 A123181 A123182`
	KEYWORD	`nonn,base`
	AUTHOR	`Douglas Stones (dssto1(AT)student.monash.edu.au), Oct 03 2006`

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Last modified February 14 18:09 EST 2012. Contains 205663 sequences.