id:A098827 - OEIS Search Results

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Square-free oblong (pronic) numbers.

+0
1

2, 30, 42, 110, 182, 506, 1406, 2162, 3422, 3782, 4290, 4830, 5402, 6006, 6806, 11130, 11342, 12210, 13110, 16770, 23870, 24806, 27390, 27722, 31862, 33306, 34410, 34782, 37442, 37830, 44310, 49062, 51302, 56406, 60762, 64770, 66822, 68906 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(1)=2 is oblong and square-free`
	MAPLE	`ts_nsq_pronic:=proc(n) local i, ans; ans:=[ ]: for i from 1 to n do if (numtheory[mobius]( i(i+1) ) = -1 ) then ans:=[ op(ans), i(i+1)]: fi od; RETURN(ans) end: ts_nsq_pronic(500);`
	CROSSREFS	`Cf. A002378, A005117.` `Sequence in context: A127026 A105962 A113695 this_sequence A078208 A105403 A134644` `Adjacent sequences: A098824 A098825 A098826 this_sequence A098828 A098829 A098830`
	KEYWORD	`nonn`
	AUTHOR	`Jani Melik (jani_melik(AT)hotmail.com), Oct 09 2004`

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

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