|
Search: id:A057175
|
|
|
| A057175 |
|
Numbers n such that (9^n + 1)/10 is a prime. |
|
+0
2
|
| |
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Repunit primes in base -9. - Paul Bourdelais (paul.bourdelais(AT)gd-ais.com)
|
|
LINKS
|
H. Dubner and T. Granlund, Primes of the Form (b^n+1)/(b+1), J. Integer Sequences, 3 (2000), #P00.2.7.
Eric Weisstein's World of Mathematics, Repunit
H. Lifchitz, Mersenne and Fermat primes field
|
|
CROSSREFS
|
Sequence in context: A139874 A107212 A002148 this_sequence A142642 A062629 A046024
Adjacent sequences: A057172 A057173 A057174 this_sequence A057176 A057177 A057178
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
njas, Sep 15 2000
|
|
EXTENSIONS
|
a(9)=49223, a probable prime, was discovered on Oct 22 2007. Trial factored to 1E11 with Fermat base 2 primality test. - Paul Bourdelais (paul.bourdelais(AT)gd-ais.com)
|
|
|
Search completed in 0.002 seconds
|
