|
Search: id:A096774
|
|
|
| A096774 |
|
Numbers n such that 9*10^n + 7 is prime. |
|
+0
3
|
|
| 1, 2, 3, 4, 5, 15, 19, 20, 46, 52, 53, 192, 380, 588, 776, 906, 1350, 1736, 2914, 7508, 15710, 16453, 17488, 18109
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
a(1) through a(12) have been certified prime. a(13) through a(19) are all Fermat and Lucas PRPs. No others less than 6300. - Jason Earls (zevi_35711(AT)yahoo.com), Aug 18 2004
|
|
LINKS
|
Makoto Kamada, Factorizations of 900...007.
Sabin Tabirca and Kieran Reynolds, Lacunary Prime Numbers.
Index entries for primes involving repunits.
|
|
EXAMPLE
|
n = 5; (9*10^5)+7 = 900007, which is prime.
|
|
MATHEMATICA
|
Do[ If[ PrimeQ[9*10^n + 7], Print[n]], {n, 0, 10000}] (from Robert G. Wilson v Jan 19 2005)
|
|
CROSSREFS
|
Sequence in context: A138986 A098552 A037340 this_sequence A145029 A145030 A102738
Adjacent sequences: A096771 A096772 A096773 this_sequence A096775 A096776 A096777
|
|
KEYWORD
|
more,nonn
|
|
AUTHOR
|
Julien Peter Benney (jpbenney(AT)ftml.net), Aug 16 2004
|
|
EXTENSIONS
|
More terms from Jason Earls (zevi_35711(AT)yahoo.com), Aug 18 2004
a(20) from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 01 2008
|
|
|
Search completed in 0.002 seconds
|
