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!)
A255921 Bases b for which no primes p with p < b exist such that p is a base-b Wieferich prime. 12
2, 3, 4, 6, 11, 12, 14, 15, 16, 20, 34, 36, 39, 47, 52, 56, 58, 59, 66, 72, 83, 84, 86, 87, 88, 90, 92, 95, 96, 102, 103, 104, 106, 108, 111, 114, 119, 123, 135, 139, 140, 142, 144, 156, 159, 160, 162, 167, 171, 175, 180, 183, 186, 187, 194, 198, 200, 203, 204 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers b such that A255920(b) = 0.

Complement of A273786. - Felix Fröhlich, Dec 03 2020

LINKS

Felix Fröhlich, Table of n, a(n) for n = 1..10000

PROG

(PARI) is(b) = forprime(p=1, b-1, if(Mod(b, p^2)^(p-1)==1, return(0))); 1

CROSSREFS

Cf. A255920, A255922, A255923, A255924, A255925, A273786.

Sequence in context: A134696 A151677 A304872 * A111338 A029457 A014859

Adjacent sequences:  A255918 A255919 A255920 * A255922 A255923 A255924

KEYWORD

nonn

AUTHOR

Felix Fröhlich, Mar 11 2015

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 July 28 08:44 EDT 2021. Contains 346321 sequences. (Running on oeis4.)