id:A133498 - OEIS Search Results

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Floor(sqrt(pi(2^n))).

+0
1

0, 1, 1, 2, 2, 3, 4, 5, 7, 9, 13, 17, 23, 32, 43, 59, 80, 110, 151, 208, 286, 394, 544, 751, 1038, 1436, 1989, 2757, 3825, 5309, 7375, 10251, 14257, 19839, 27621, 38473, 53613, 74742, 104241, 145436, 202985, 283401, 395804, 552957, 772733, 1080160, 1510297 (list; graph; listen)

	OFFSET	`0,4`
	FORMULA	`a(n) = floor(sqrt(A007053[n]))`
	EXAMPLE	`a(4)=2 because pi(2^4)=6 and the greatest integer less than or equal to sqrt(6) is 2.`
	CROSSREFS	`Cf. A007053.` `Sequence in context: A072493 A064324 A032277 this_sequence A097600 A018128 A032189` `Adjacent sequences: A133495 A133496 A133497 this_sequence A133499 A133500 A133501`
	KEYWORD	`nonn`
	AUTHOR	`Andrew V. Sutherland (drew(AT)math.mit.edu), Dec 01 2007`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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