login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 22 16:37 EST 2020. Contains 331152 sequences. (Running on oeis4.)