OFFSET
1,1
COMMENTS
Digits are in ascending order beginning with 9 and after 9 comes 0.
The sequence "Primes with n consecutive digits descending beginning with the digit nine" has no terms.
There is no further term up to 26000. - Farideh Firoozbakht, Sep 11 2006
EXAMPLE
13 is a term since 9012345678901 is a prime.
MATHEMATICA
fQ[n_] := PrimeQ@ FromDigits@ Mod[8+Range@n, 10]; lst = {}; Do[ If[fQ@n, AppendTo[lst, n]; Print@n], {n, 5000}]; lst
Flatten[Position[Table[FromDigits[PadRight[{}, n, {9, 0, 1, 2, 3, 4, 5, 6, 7, 8}]], {n, 100}], _?PrimeQ]] (* Harvey P. Dale, Sep 06 2015 *)
CROSSREFS
KEYWORD
base,bref,hard,nonn
AUTHOR
Robert G. Wilson v, Jul 05 2006
STATUS
approved