id:A132275 - OEIS Search Results

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a(1)=1. a(n+1) = sum{k=1 to n} (a(k)th integer from among those positive integers which are coprime to a(n+1-k)).

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1, 1, 2, 4, 6, 15, 33, 73 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`The integers coprime to a(1)=1 are: 1,2,3,4,5,6,7... The a(5)th=6th of these is 6. The integers coprime to a(2)=1 are: 1,2,3,4,5... The a(4)th=4th of these is 4. The integers coprime to a(3)=2 are: 1,3,5,7,... The a(3)rd=2nd of these is 3. The integers coprime to a(4)=4 are: 1,3,5,7,... The a(2)nd=1st of these is 1. And the integers coprime to a(5)=6 are: 1,5,7,... The a(1)st=1st of these is 1. So a(6) = 6 + 4 + 3 + 1 + 1 = 15.`
	CROSSREFS	`Cf. A132273, A132274.` `Sequence in context: A077637 A077639 A039791 this_sequence A127679 A049022 A136033` `Adjacent sequences: A132272 A132273 A132274 this_sequence A132276 A132277 A132278`
	KEYWORD	`more,nonn`
	AUTHOR	`Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Aug 16 2007`

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Last modified December 3 01:16 EST 2008. Contains 151161 sequences.