OFFSET
1,3
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[0, 300], PrimeQ[FromDigits[Join[{7}, IntegerDigits[#], {9}]]]&] (* Harvey P. Dale, Dec 03 2021 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, May 15 1998
EXTENSIONS
Offset changed by Andrew Howroyd, Aug 13 2024
STATUS
approved