|
| |
|
|
A101397
|
|
Numbers n such that 4*10^n+3 is prime.
|
|
2
| |
|
|
0, 1, 3, 7, 10, 40, 419, 449, 1737, 2245, 3131, 3813, 5345, 5659, 5681, 8410, 9097, 11293, 21061
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,3
|
|
|
COMMENTS
| See Kamada link for search limit and prime vs. PRP status.
|
|
|
LINKS
| Makoto Kamada, Factorizations of 400...003.
Sabin Tabirca and Kieran Reynolds, Lacunary Prime Numbers.
Index entries for primes involving repunits.
|
|
|
EXAMPLE
| n = 1, 3, 7, 10 are members since 43, 4003, 40000003 and 40000000003 are prime numbers.
|
|
|
MATHEMATICA
| Do[ If[ PrimeQ[4*10^n + 3], Print[n]], {n, 0, 10000}] (from Robert G. Wilson v Jan 18 2005)
|
|
|
CROSSREFS
| Cf. A049054, A081677, A056806.
Sequence in context: A193650 A041783 A041899 * A042229 A042373 A042775
Adjacent sequences: A101394 A101395 A101396 * A101398 A101399 A101400
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Julien Peter Benney (jpbenney(AT)ftml.net), Jan 15 2005
|
|
|
EXTENSIONS
| a(18)-a(19) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 10 2010
|
| |
|
|
