id:A078694 - OEIS Search Results

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Numbers n such that floor(2*pi*n) is prime.

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5, 6, 7, 18, 21, 25, 26, 40, 41, 42, 49, 61, 62, 69, 70, 83, 91, 103, 104, 105, 110, 113, 127, 131, 132, 145, 148, 154, 167, 169, 174, 188, 189, 190, 196, 197, 210, 231, 237, 252, 258, 259, 272, 274, 279, 280, 294, 315, 323, 336, 339, 344, 357, 364, 365, 379 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`This sequence gives the radii of circles of positive integer radius which have the integer parts of their circumferences prime.`
	MATHEMATICA	`Select[Range[10^3], PrimeQ[Round[2 Pi # ]] &]`
	CROSSREFS	`Sequence in context: A031029 A134985 A111018 this_sequence A048007 A066876 A048042` `Adjacent sequences: A078691 A078692 A078693 this_sequence A078695 A078696 A078697`
	KEYWORD	`easy,nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Dec 17 2002`

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

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