|
| |
|
|
A056804
|
|
Numbers n such that 7*10^n + 1 is prime.
|
|
4
| |
|
|
1, 2, 3, 4, 5, 8, 9, 45, 136, 142, 158, 243, 923, 1235, 2196, 4650, 6119, 7324, 9543, 13494, 20310, 20360
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
LINKS
| Makoto Kamada, Factorizations of 700...001.
Sabin Tabirca and Kieran Reynolds, Lacunary Prime Numbers.
Index entries for primes involving repunits.
|
|
|
MATHEMATICA
| Do[ If[ PrimeQ[ 7*10^n + 1], Print[ n ]], {n, 0, 10000}]
|
|
|
CROSSREFS
| Sequence in context: A152606 A057911 A085266 * A101547 A047597 A005233
Adjacent sequences: A056801 A056802 A056803 * A056805 A056806 A056807
|
|
|
KEYWORD
| more,nonn
|
|
|
AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 22 2000
|
|
|
EXTENSIONS
| a(15)-a(20) from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005
a(21)-a(22) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010
|
| |
|
|
