A081237 - OEIS

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A081237

Numbers n with no k, 0<k<n, such that mu(n-k)=mu(n)=mu(n+k), where mu=A008683 (Moebius function).

1, 2, 3, 4, 6, 9, 15, 21 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`A081236(n)=0.` `Conjecture: there are no more terms.` `Next term, if one exists, exceeds 10000000000. [From Sean A. Irvine (sairvin(AT)xtra.co.nz), Sep 08 2009]`
	CROSSREFS	`Sequence in context: A096824 A192488 A089797 * A022159 A022161 A127604` `Adjacent sequences: A081234 A081235 A081236 * A081238 A081239 A081240`
	KEYWORD	`nonn,more`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 11 2003`

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Last modified February 14 17:55 EST 2012. Contains 205653 sequences.