A206097 - OEIS

A206097

Fibonacci numbers F with 2 distinct prime divisors, and F+2 or F-2 also with 2 distinct prime divisors.

55, 4181, 17711, 121393, 5702887 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	LINKS	`Table of n, a(n) for n=1..5.`
	EXAMPLE	`55=511; (55+2)=319, 4181=37113; (4181+2)=4789`
	MATHEMATICA	`Select[Fibonacci[Range[300]], Last/@FactorInteger[#]=={1, 1} && (Last/@FactorInteger[#+2]=={1, 1} \|\| Last/@FactorInteger[#-2]=={1, 1})&]`
	CROSSREFS	`Cf. A000045` `Sequence in context: A060077 A035323 A250833 * A103918 A013537 A056567` `Adjacent sequences: A206094 A206095 A206096 * A206098 A206099 A206100`
	KEYWORD	`nonn`
	AUTHOR	`Vladimir Joseph Stephan Orlovsky, Feb 03 2012`
	STATUS	`approved`

Last modified March 30 23:40 EDT 2023. Contains 361623 sequences. (Running on oeis4.)