|
| |
|
|
A101396
|
|
Numbers n such that 4*10^n-9 is prime.
|
|
1
| |
|
|
1, 17, 19, 29, 43, 119, 173, 949, 1609, 5579, 19679
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| No further terms < 30000.
|
|
|
LINKS
| Makoto Kamada, Factorizations of 399...991.
Index entries for primes involving repunits.
|
|
|
EXAMPLE
| n = 1, 17, 19 are members since 31, 399999999999999991 and 39999999999999999991 are primes.
|
|
|
MATHEMATICA
| Do[ If[ PrimeQ[4*10^n - 9], Print[n]], {n, 0, 10000}]
|
|
|
CROSSREFS
| Cf. A095714.
Sequence in context: A038969 A065742 A155089 * A050266 A045803 A098933
Adjacent sequences: A101393 A101394 A101395 * A101397 A101398 A101399
|
|
|
KEYWORD
| more,nonn
|
|
|
AUTHOR
| Julien Peter Benney (jpbenney(AT)ftml.net), Jan 15 2005
|
|
|
EXTENSIONS
| a(11) from Kamada link by Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
|
| |
|
|
