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

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A128668 Primes p such that p^2 divides 17^(p-1) - 1. 10
2, 3, 46021, 48947, 478225523351 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Mossinghoff showed that there are no further terms up to 10^14.

LINKS

Table of n, a(n) for n=1..5.

Richard Fischer, Fermat quotients B^(P-1) == 1 (mod P^2)

M. J. Mossinghoff, Wieferich pairs and Barker sequences, Des. Codes Cryptogr. 53 (2009), 149-163.

CROSSREFS

Cf. A001220, A014127, A123692, A123693, A128667, A090968, A128669, A039951.

Sequence in context: A197635 A171161 A101445 * A216977 A038537 A235984

Adjacent sequences:  A128665 A128666 A128667 * A128669 A128670 A128671

KEYWORD

hard,more,nonn

AUTHOR

Alexander Adamchuk, Mar 26 2007

EXTENSIONS

The prime 478225523351 was found by Richard Fischer on Oct 25 2005

Extension corrected by Jonathan Sondow, Jun 24 2010

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 7 11:42 EST 2016. Contains 278874 sequences.