|
|
A064217
|
|
Least k such that k*7^n +/- 1 are twin primes.
|
|
3
|
|
|
4, 6, 18, 24, 138, 60, 150, 720, 150, 234, 138, 966, 138, 420, 60, 1584, 420, 60, 1830, 1134, 162, 1080, 1482, 684, 240, 10074, 3378, 3300, 2742, 984, 2400, 4050, 5262, 3510, 3378, 960, 3612, 516, 6840, 6474, 4680, 4950, 12612, 7986, 4290, 8046, 5208
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,1
|
|
LINKS
|
Table of n, a(n) for n=0..46.
|
|
MATHEMATICA
|
Do[ k = 1; While[ ! PrimeQ[ k*7^n + 1 ] || ! PrimeQ[ k*7^n - 1 ], k++ ]; Print[ k ], {n, 0, 50} ]
|
|
CROSSREFS
|
Cf. A063983, A064213, A064214, A064215, A064218, A064220, A064221.
Sequence in context: A219190 A337617 A120391 * A026623 A026689 A138276
Adjacent sequences: A064214 A064215 A064216 * A064218 A064219 A064220
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Robert G. Wilson v, Sep 21 2001
|
|
EXTENSIONS
|
Offset corrected by Georg Fischer, May 01 2022
|
|
STATUS
|
approved
|
|
|
|