A109473 - OEIS

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A109473

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

1, 422, 174, 22830, 9216772051254, 234374 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	EXAMPLE	`n a(n) = r` `1 1` `2 422` `3 174` `5 22830` `6 9216772051242 (from Jud McCranie, JudMcCranie(AT)ugaalum.uga.edu, Aug 28, 2005)` `7 234374` `10 ?` `11 21971536246 (from Jud McCranie, JudMcCranie(AT)ugaalum.uga.edu, Aug 29, 2005)` `13 8678016978774 (from Jud McCranie, JudMcCranie(AT)ugaalum.uga.edu, Aug 31, 2005)`
	CROSSREFS	`See A109505 for another version. Cf. A005117, A051681.` `Sequence in context: A068701 A083193 A109505 * A200200 A203099 A096024` `Adjacent sequences: A109470 A109471 A109472 * A109474 A109475 A109476`
	KEYWORD	`nonn,hard`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), 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 February 16 04:18 EST 2012. Contains 205860 sequences.