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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A123692 Primes p such that p^2 divides 5^(p-1) - 1. 8
2, 20771, 40487, 53471161, 1645333507, 6692367337, 188748146801 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Dorais and Klyve proved that there are no further terms up to 9.7*10^14.

LINKS

F. G. Dorais and D. Klyve, A Wieferich prime search up to p < 6.7*10^15, J. Integer Seq. 14 (2011), Art. 11.9.2, 1-14.

C. K. Caldwell, The Prime Glossary, Fermat quotient.

CROSSREFS

Cf. A001220, A014127, A123693,  A123693, A128667, A128668, A090968, A128669, A096082.

Sequence in context: A158344 A124364 A173156 * A132942 A131558 A133857

Adjacent sequences:  A123689 A123690 A123691 * A123693 A123694 A123695

KEYWORD

hard,nonn,more

AUTHOR

Max Alekseyev (maxale(AT)gmail.com), Oct 07 2006

EXTENSIONS

More terms from Alexander Adamchuk, Nov 27 2006

Updated by Max Alekseyev (maxale(AT)gmail.com), Jan 29 2012

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 15 19:15 EST 2012. Contains 205852 sequences.