id:A074252 - OEIS Search Results

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Number of primes <= n is equal to the sum of square-free numbers from the smallest prime factor of n to the largest prime factor of n.

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1, 4, 12, 30, 84, 9150, 47244, 75360, 177287, 281868, 705790, 3043504, 9669715, 20139930, 32043111, 67447484, 291217662, 7544909388, 8396469108, 21425170627 (list; graph; listen)

	OFFSET	`0,2`
	EXAMPLE	`pi(84) = 23 and 84 = 2^237 and 2+3+5+6+7 = 23.`
	CROSSREFS	`Cf. A000720.` `Adjacent sequences: A074249 A074250 A074251 this_sequence A074253 A074254 A074255` `Sequence in context: A000298 A006802 A068055 this_sequence A074210 A005289 A037255`
	KEYWORD	`more,nonn,new`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Sep 20 2002`
	EXTENSIONS	`a(6)-a(19) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Oct 12 2008`

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

AT&T Labs Research