login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A216553 Numbers n such that the n-th Fibonacci number is prime, but cannot be written in the form a^2 + 3*b^2. 0
3, 5, 11, 13, 29, 43, 83, 131, 509, 571, 2971, 4723, 5387, 9677, 30757, 130021, 148091, 201107, 397379, 433781, 931517, 1803059 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..22.

Blair Kelly, Factorizations of Fibonacci and Lucas numbers

CROSSREFS

Cf. A000045, A001605.

Sequence in context: A237349 A095082 A265396 * A250298 A260224 A105071

Adjacent sequences:  A216550 A216551 A216552 * A216554 A216555 A216556

KEYWORD

nonn

AUTHOR

V. Raman, Sep 08 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 18 11:29 EST 2022. Contains 350454 sequences. (Running on oeis4.)