|
Search: id:A102979
|
|
|
| A102979 |
|
Numbers n such that 3*10^n + 8*R_n - 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n. |
|
+0
2
|
| |
|
|
OFFSET
|
1,3
|
|
|
COMMENT
|
Also numbers n such that (35*10^n-17)/9 is prime.
|
|
LINKS
|
Makoto Kamada, Factorizations of 388...887.
Index entries for primes involving repunits.
|
|
MATHEMATICA
|
Do[ If[ PrimeQ[(35*10^n - 17)/9], Print[n]], {n, 0, 10000}]
|
|
CROSSREFS
|
Sequence in context: A158880 A137040 A088021 this_sequence A069942 A146202 A145720
Adjacent sequences: A102976 A102977 A102978 this_sequence A102980 A102981 A102982
|
|
KEYWORD
|
bref,more,nonn
|
|
AUTHOR
|
Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004
|
|
EXTENSIONS
|
Additional term 10176 (a PRP) from Serge Batalov (batalovs(AT)yahoo.com), Oct 12 2008
|
|
|
Search completed in 0.002 seconds
|
