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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A128454 Numbers k such that the absolute value of 14^k - k^14 is prime. 6
1, 5, 11, 89, 101, 579, 655, 8115 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(9) > 50000. - Robert Price, Jun 17 2019

LINKS

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

MATHEMATICA

Do[If[PrimeQ[Abs[14^n - n^14]], Print[n]], {n, 10^4}] (* Ryan Propper, Mar 27 2007 *)

PROG

(PARI) is(n)=ispseudoprime(abs(14^n-n^14)) \\ Charles R Greathouse IV, Feb 17 2017

CROSSREFS

Cf. A072180, A109387, A117705, A117706, A128447, A128448, A128449, A128450, A128451, A122003, A128453.

Sequence in context: A057726 A057727 A228503 * A188514 A301923 A120778

Adjacent sequences:  A128451 A128452 A128453 * A128455 A128456 A128457

KEYWORD

hard,nonn,more

AUTHOR

Alexander Adamchuk, Mar 03 2007

EXTENSIONS

One more term from Ryan Propper, Mar 27 2007

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 September 20 20:02 EDT 2020. Contains 337265 sequences. (Running on oeis4.)