A125729 - OEIS

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A125729

Numbers whose base 7 representation is 555....5.

0, 5, 40, 285, 2000, 14005, 98040, 686285, 4804000, 33628005, 235396040, 1647772285, 11534406000, 80740842005, 565185894040, 3956301258285, 27694108808000, 193858761656005, 1357011331592040, 9499079321144285 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`a(n)=5(7^(n-1)-1)/6.` `a(n)=7a(n-1)+5 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Sep 30 2010]`
	EXAMPLE	`Base 7.............decimal` `0........................0` `5........................5` `55......................40` `555....................285` `5555..................2000` `55555................14005` `555555...............98040` `5555555.............686285` `55555555...........4804000` `555555555.........33628005` `etc....................etc...`
	MAPLE	`seq(5*(7^n-1)/6, n=0..21);`
	CROSSREFS	`Sequence in context: A087632 A124306 A124545 * A144069 A073505 A145841` `Adjacent sequences: A125726 A125727 A125728 * A125730 A125731 A125732`
	KEYWORD	`easy,nonn`
	AUTHOR	`Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 02 2007`

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Last modified February 17 06:27 EST 2012. Contains 205998 sequences.