id:A062837 - OEIS Search Results

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Numbers n such that n, 2n+1, 3n+1 are all square-free.

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2, 3, 6, 7, 10, 11, 14, 15, 19, 23, 26, 30, 34, 35, 38, 39, 42, 43, 46, 47, 51, 55, 59, 66, 70, 71, 74, 78, 79, 82, 86, 91, 95, 102, 106, 107, 110, 111, 115, 118, 119, 123, 127, 131, 134, 138, 142, 143, 146, 151, 154, 155, 159, 167, 170, 174, 178, 179, 182, 186 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(PARI) j=[]; for(n=1, 200, if(issquarefree(n) && issquarefree(2n+1) && issquarefree(3n+1), j=concat(j, n))); j`
	CROSSREFS	`Cf. A005117.` `Sequence in context: A107998 A053438 A042964 this_sequence A073170 A014689 A117206` `Adjacent sequences: A062834 A062835 A062836 this_sequence A062838 A062839 A062840`
	KEYWORD	`nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Jul 21 2001`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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