|
Search: id:A128002
|
|
|
| A128002 |
|
Numbers n such that (31^n - 1)/30 is prime. |
|
+0
13
|
| |
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
9973 is a term found by Richard Fischer in 2004. - Alexander Adamchuk (alex(AT)kolmogorov.com), Feb 11 2007
|
|
REFERENCES
|
H. Dubner, Generalized repunit primes, Math. Comp., 61 (1993), 927-930.
|
|
LINKS
|
H. Lifchitz, Mersenne and Fermat primes field
|
|
MATHEMATICA
|
Select[Prime[Range[100]], PrimeQ[(31^#-1)/30]&]
|
|
CROSSREFS
|
Cf. A028491, A004061, A004062, A004063, A004023, A005808, A004064, A016054, A006032, A006033, A006034, A006035. Cf. A127995, A127996, A127997, A127998, A127999, A128000, A098438, A128003, A128004, A128005.
Sequence in context: A024835 A144861 A066436 this_sequence A074275 A051411 A101121
Adjacent sequences: A127999 A128000 A128001 this_sequence A128003 A128004 A128005
|
|
KEYWORD
|
hard,more,nonn
|
|
AUTHOR
|
Alexander Adamchuk (alex(AT)kolmogorov.com), Feb 11 2007
|
|
EXTENSIONS
|
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
|
|
|
Search completed in 0.002 seconds
|
