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Difference between revisions of "Williams prime MM 5"

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==Definition==
 
==Definition==
 
[[Prime number|Primes]] of the form <math>4 \cdot 5^n-1</math>.
 
[[Prime number|Primes]] of the form <math>4 \cdot 5^n-1</math>.

Revision as of 10:36, 12 December 2018

Reserved! This sequence is currently reserved by: User:Karbon

Definition

Primes of the form [math]\displaystyle{ 4 \cdot 5^n-1 }[/math].

Data

Primes for n:

1, 3, 9, 13, 15, 25, 39, 69, 165, 171, 209, 339, 2033, 6583, 15393, 282989

Search range

321000 (2018-12-07)

History

Date Remark
2018-12-07 Found n=282989, Karsten Bonath
2007-20-12 Geoff Reynolds checked to n=200000
2007-07-13 Geoff Reynolds checked to n=110000
2006-08 Found n=15393, antiroach
1981 Found n=1 ... 339, checked to n=500, H. C. Williams

External links