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A206097 Fibonacci numbers F with 2 distinct prime divisors, and F+2 or F-2 also with 2 distinct prime divisors. 0

%I

%S 55,4181,17711,121393,5702887

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

%e 55=5*11; (55+2)=3*19, 4181=37*113; (4181+2)=47*89

%t Select[Fibonacci[Range[300]], Last/@FactorInteger[#]=={1,1} && (Last/@FactorInteger[#+2]=={1,1} || Last/@FactorInteger[#-2]=={1,1})&]

%Y Cf. A000045

%K nonn

%O 1,1

%A _Vladimir Joseph Stephan Orlovsky_, Feb 03 2012

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Last modified February 8 23:03 EST 2023. Contains 360153 sequences. (Running on oeis4.)