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!)
A265484 Numbers n such that 36^n - 6^n - 1 is prime. 1
1, 2, 3, 4, 24, 63, 81, 92, 165, 232, 236, 591, 669, 1343, 2973, 3630, 5600, 7019, 17169, 31945, 52172 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
For n = 1, 2, 3, 4, 24 the corresponding primes are 29, 1259, 46439, 1678319, 22452257707354557235348829785471057919.
a(22) > 10^5. - Robert Price, Jan 06 2020
LINKS
EXAMPLE
4 is in the sequence because 36^4 - 6^4 - 1 = 1678319 is prime.
MATHEMATICA
Select[Range[1000], PrimeQ[36^# - 6^# - 1] &]
PROG
(Magma) [n: n in [0..300] | IsPrime(36^n-6^n-1)];
(PARI) for(n=1, 1e3, if(ispseudoprime(36^n - 6^n - 1), print1(n, ", "))) \\ Altug Alkan, Dec 12 2015
CROSSREFS
Cf. similar sequences listed in A265481.
Sequence in context: A233344 A329566 A329532 * A000336 A287433 A235041
KEYWORD
nonn,more
AUTHOR
Vincenzo Librandi, Dec 12 2015
EXTENSIONS
a(14)-a(18) from Ray Chandler, Sep 25 2019
a(18) corrected and a(19)-a(21) added by Robert Price, Jan 06 2020
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 23 05:53 EDT 2024. Contains 373629 sequences. (Running on oeis4.)