id:A058267 - OEIS Search Results

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An approximation to sigma_{1/2}(n): round( sum_{ d divides n } sqrt(d) ).

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1, 2, 3, 4, 3, 7, 4, 7, 6, 8, 4, 12, 5, 9, 9, 11, 5, 14, 5, 14, 10, 10, 6, 20, 8, 11, 11, 16, 6, 21, 7, 17, 12, 12, 12, 25, 7, 13, 13, 23, 7, 24, 8, 19, 19, 14, 8, 31, 11, 20, 14, 20, 8, 26, 14, 26, 15, 15, 9, 39, 9, 16, 21, 25, 15, 28, 9, 23, 16, 28, 9, 42, 10 (list; graph; listen)

	OFFSET	`1,2`
	MAPLE	`with(numtheory); f := proc(n) local d, t1, t2; t2 := 0; t1 := divisors(n); for d in t1 do t2 := t2 + sqrt(d) end do; t2 end proc; # exact value of sigma_{1/2}(n)`
	CROSSREFS	`Sequence in context: A116991 A103634 A098596 this_sequence A048259 A102086 A009184` `Adjacent sequences: A058264 A058265 A058266 this_sequence A058268 A058269 A058270`
	KEYWORD	`nonn`
	AUTHOR	`njas, Dec 08 2000`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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