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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A297348 Numbers k such that 12*13^k - 1 is prime. 1
0, 2, 7, 11, 36, 164, 216, 302, 311, 455, 738, 1107, 2244, 3326, 4878 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Williams primes to base 12.

LINKS

Table of n, a(n) for n=1..15.

Steven Harvey, Williams primes

H. C. Williams, The primality of certain integers of the form 2Ar^n - 1, Acta Arith. 39 (1981), 7-17.

MATHEMATICA

Select[Range[0, 10000], PrimeQ[12*13^n-1] &]

PROG

(PARI) for(n=0, 10000, if(isprime(12*13^n-1), print1(n, ", ")))

(MAGMA) [n: n in [0..10000] |IsPrime(12*13^n-1)]

CROSSREFS

Cf. A003307, A272057, A046865, A079906, A046866, A268061, A268356, A056725, A046867, A079907, A273523.

Sequence in context: A026133 A026162 A025189 * A023250 A106013 A175445

Adjacent sequences:  A297345 A297346 A297347 * A297349 A297350 A297351

KEYWORD

nonn,more,hard

AUTHOR

Tim Johannes Ohrtmann, Feb 15 2018

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 August 21 06:54 EDT 2019. Contains 326162 sequences. (Running on oeis4.)