id:A076043 - OEIS Search Results

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a(1)=2; for n>1, a(n) is smallest square-free number (greater than 1) not occurring earlier such that a(n) + a(n-1) is a square.

+0
1

2, 7, 29, 35, 14, 11, 5, 31, 33, 3, 6, 10, 15, 21, 43, 38, 26, 23, 13, 51, 30, 19, 17, 47, 34, 66, 55, 89, 107, 37, 159, 97, 227, 62, 59, 22, 42, 39, 61, 83, 86, 58, 111, 85, 239, 122, 74, 70, 155, 41, 103, 93, 163, 161, 95, 101, 223, 138, 87, 57, 139, 185, 71, 73, 123, 46 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Conjecture: every square-free number except 1 is a member.`
	CROSSREFS	`Sequence in context: A013181 A122118 A059803 this_sequence A116968 A162172 A083016` `Adjacent sequences: A076040 A076041 A076042 this_sequence A076044 A076045 A076046`
	KEYWORD	`nonn,easy`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 03 2002`
	EXTENSIONS	`Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 20 2003`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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