id:A117204 - OEIS Search Results

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Squarefree positive integers n such that (2n+1) is also squarefree.

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1, 2, 3, 5, 6, 7, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21, 23, 25, 26, 27, 28, 29, 30, 32, 33, 34, 35, 36, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 59, 61, 63, 64, 65, 66, 68, 69, 70, 71, 72, 74, 75, 77, 78, 79, 80, 81, 82, 83, 86, 88, 89, 90, 91 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`2*a(n) + 1 = A117203(n)`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)`
	EXAMPLE	`10 and 2*10 +1 = 21 are both squarefree, so 10 is in the sequence.`
	CROSSREFS	`Cf. A005117, A117203, A117206.` `Cf. A005384, A111153.` `Sequence in context: A085118 A166158 A137313 this_sequence A028805 A117344 A129127` `Adjacent sequences: A117201 A117202 A117203 this_sequence A117205 A117206 A117207`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet Mar 02 2006`
	EXTENSIONS	`More terms from Jonathan Vos Post (jvospost3(AT)gmail.com), Mar 03 2006`

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Last modified December 19 21:04 EST 2009. Contains 171054 sequences.

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