id:A090461 - OEIS Search Results

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Numbers n such that there is a permutation of the numbers 1 to n such that the sum of adjacent numbers is a square.

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5

15, 16, 17, 23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Conjecture that there is a solution for all n > 24. See A090460 for a count of the number of essentially different solutions.`
	EXAMPLE	`See A071983`
	CROSSREFS	`Cf. A071983, A071984 (number of circular solutions), A090460.` `Cf. A078107 (n for which there is no solution).` `Sequence in context: A165836 A094836 A004504 this_sequence A138598 A160661 A114841` `Adjacent sequences: A090458 A090459 A090460 this_sequence A090462 A090463 A090464`
	KEYWORD	`nonn`
	AUTHOR	`T. D. Noe (noe(AT)sspectra.com), Dec 01 2003`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.