A088323 - OEIS

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A088323

Number of numbers b>1 such that n is a repunit in base b representation.

0, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; internal format)

	OFFSET	`2,6`
	COMMENTS	`is a(n) < 4 ?;` `n>2: a(n) > 0 as n = (n-1)^1 + (n-1)^0.`
	LINKS	`Eric Weisstein's World of Mathematics, Repunit`
	EXAMPLE	`a(31)=3: 31 = 2^4+2^3+2^2+2^1+2^0 = 3^3+3^1+3^0 = 30^1+30^0.`
	CROSSREFS	`Cf. A000225, A003462, A002275, A068953.` `Sequence in context: A174435 A088530 A058060 * A003652 A071625 A049100` `Adjacent sequences: A088320 A088321 A088322 * A088324 A088325 A088326`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 06 2003`

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Last modified February 16 04:47 EST 2012. Contains 205860 sequences.