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

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

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Last modified November 30 21:57 EST 2022. Contains 358453 sequences. (Running on oeis4.)