id:A066875 - OEIS Search Results

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Numbers n such that prime(n+1)+prime(n-1)=2*prime(n).

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3, 16, 37, 40, 47, 55, 56, 74, 103, 108, 111, 119, 130, 161, 165, 185, 188, 195, 200, 219, 240, 272, 273, 292, 340, 359, 388, 420, 427, 465, 466, 509, 521, 554, 600, 606, 622, 630, 634, 668, 683, 684, 703, 710, 711, 734, 762, 792, 814, 822, 823, 830, 831, 883 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n) = PrimePi(A006562(n)).`
	MATHEMATICA	`Select[Range[2, 1000], Prime[ # ] == (Prime[ # + 1] + Prime[ # - 1])/2 &] (Chandler)`
	CROSSREFS	`Sequence in context: A076153 A031302 A068415 this_sequence A081270 A147874 A092466` `Adjacent sequences: A066872 A066873 A066874 this_sequence A066876 A066877 A066878`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 21 2002`
	EXTENSIONS	`Corrected by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jan 09 2007`

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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.

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