id:A125119 - OEIS Search Results

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Values of repunits with odd length L in base (L+3)/2 representation.

+0
2

1, 13, 341, 19531, 2015539, 329554457, 78536544841, 25736391511831, 11111111111111111, 6115909044841454629, 4182283628124518315101, 3479492117784426363920483, 3461445831219105624193478971 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Central terms of the triangle in A125118: a(n)=A125118(2*n-1,n).`
	LINKS	`Eric Weisstein's World of Mathematics, Repunit`
	FORMULA	`a(n) = Sum((n+1)^k: 0<=k<=2*(n-1)).`
	EXAMPLE	`a(4) = [1111111]_5 = (((((5+1)5+1)5+1)5+1)5+1)*5+1 = 19531.`
	CROSSREFS	`Sequence in context: A041315 A041312 A096717 this_sequence A160396 A078738 A165391` `Adjacent sequences: A125116 A125117 A125118 this_sequence A125120 A125121 A125122`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 21 2006`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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