OFFSET
0,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 0..1000
EXAMPLE
a(1)=7 -> 111{2}=21{3}=13{4}=12{5}=11{6}=10{7}=7{8}=7{9}=7{10} -> 1112113121110777 is a prime.
MATHEMATICA
Select[Range[4000], PrimeQ[FromDigits[Flatten[Table[IntegerDigits[#, n], {n, 2, 10}]]]]&] (* Harvey P. Dale, Aug 20 2017 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Feb 15 2000
STATUS
approved