OFFSET
1,1
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..10000
MATHEMATICA
Select[Prime[Range[3 10^3]], Complement[IntegerDigits[#], {1, 7, 9}] == {}&]
PROG
(Magma) [p: p in PrimesUpTo(3*10^4) | Set(Intseq(p)) subset [1, 7, 9]];
CROSSREFS
KEYWORD
nonn,easy,base
AUTHOR
Vincenzo Librandi, Aug 11 2015
STATUS
approved