|
Search: id:A114019
|
|
|
| A114019 |
|
Largest n-digit prime whose digit reversal is also prime. |
|
+0
4
|
|
| 7, 97, 991, 9967, 99989, 999983, 9999971, 99999827, 999999893, 9999999967, 99999999977, 999999999959, 9999999999799, 99999999999959, 999999999999877, 9999999999999571, 99999999999997997, 999999999999999737
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
MATHEMATICA
|
f[n_] := Block[{k = 10^n}, While[ !PrimeQ[k] || !PrimeQ[FromDigits@Reverse@IntegerDigits@k], k-- ]; k]; Array[f, 19] (* Robert G. Wilson v *)
|
|
CROSSREFS
|
Cf. A113018.
Sequence in context: A071361 A007810 A146758 this_sequence A127892 A125590 A068694
Adjacent sequences: A114016 A114017 A114018 this_sequence A114020 A114021 A114022
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 12 2005
|
|
EXTENSIONS
|
More terms from Robert G. Wilson v (rgwv(at)rgwv.com), Nov 19 2005
|
|
|
Search completed in 0.002 seconds
|
