id:A093820 - OEIS Search Results

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a(n) = Sum(GCD(n,a(k)): 1<=k<n) for n>1; a(1) = 1.

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1, 1, 2, 4, 4, 8, 6, 22, 10, 24, 20, 42, 12, 36, 32, 64, 16, 64, 18, 82, 50, 60, 22, 144, 60, 48, 64, 96, 28, 172, 30, 282, 78, 64, 70, 256, 36, 72, 106, 254, 80, 204, 84, 176, 166, 88, 92, 518, 78, 200, 136, 210, 104, 244, 134, 346, 96, 112, 58, 538, 120, 120, 216 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n) = n-1 iff n is prime.`
	CROSSREFS	`Cf. A006579.` `Sequence in context: A077764 A110794 A117295 this_sequence A095400 A098820 A062383` `Adjacent sequences: A093817 A093818 A093819 this_sequence A093821 A093822 A093823`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 21 2004`
	EXTENSIONS	`Definition corrected by Annti Karttunen ((his_firstname.his_surname(AT)iki.fi) Jun 04 2004`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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