OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..13
Makoto Kamada, Prime numbers of the form 500...003.
MATHEMATICA
Select[5 10^Range[80] + 3, PrimeQ] (* Vincenzo Librandi, May 11 2013 *)
PROG
(Magma)[ a: n in [0..250]|IsPrime(a) where a is 5*10^n+3]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Dec 10 2010
STATUS
approved