id:A109473 - OEIS Search Results

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As n runs through the square-free numbers, consider the smallest pair of consecutive square-free numbers (r,s) with gcd(r,s) = n; sequence gives values of r.

+0
2

1, 422, 174, 22830, 9216772051254, 234374 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`n a(n) = r` `1 1` `2 422` `3 174` `5 22830` `6 9216772051242 (from Jud McCranie, j.mccranie(AT)comcast.net, Aug 28, 2005)` `7 234374` `10 ?` `11 21971536246 (from Jud McCranie, j.mccranie(AT)comcast.net, Aug 29, 2005)` `13 8678016978774 (from Jud McCranie, j.mccranie(AT)comcast.net, Aug 31, 2005)`
	CROSSREFS	`See A109505 for another version. Cf. A005117, A051681.` `Adjacent sequences: A109470 A109471 A109472 this_sequence A109474 A109475 A109476` `Sequence in context: A068701 A083193 A109505 this_sequence A096024 A091293 A134218`
	KEYWORD	`nonn,hard`
	AUTHOR	`njas, based on a suggestion from David W. Wilson (davidwwilson(AT)comcast.net), Aug 20 2005`
	EXTENSIONS	`a(10) is the first unknown value.`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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