OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1001
EXAMPLE
333 becomes 3(2)3(2)3 which is prime 32323.
MATHEMATICA
Select[Range[10, 600], PrimeQ[FromDigits[Riffle[IntegerDigits[#], 2]]]&] (* Harvey P. Dale, Sep 13 2014 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Aug 15 1999
EXTENSIONS
Offset changed to 1 by Georg Fischer, Oct 15 2019
STATUS
approved