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A177504
Primes of the form 5*10^n-9.
1
41, 491, 49991, 49999991, 4999999999999999999999991
OFFSET
1,1
LINKS
MATHEMATICA
Select[Table[5 10^n - 9, {n, 250}], PrimeQ] (* Vincenzo Librandi, Jan 03 2014 *)
PROG
(Magma)[a: n in [0..250] | IsPrime(a) where a is 5*10^n-9];
CROSSREFS
Sequence in context: A098958 A269073 A086949 * A297976 A208048 A298839
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Dec 11 2010
STATUS
approved