login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A216564 Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + 2*b^2. 0
7, 19, 31, 79, 5851, 8467, 13963, 574219 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

Blair Kelly, Factorizations of Fibonacci and Lucas numbers

CROSSREFS

Cf. A000032, A001606.

Sequence in context: A141338 A237366 A216531 * A145042 A153892 A038869

Adjacent sequences:  A216561 A216562 A216563 * A216565 A216566 A216567

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 June 25 05:41 EDT 2019. Contains 324346 sequences. (Running on oeis4.)