OFFSET
1,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[100], ! PrimeQ[10^(IntegerLength[#]) - #]&]
CROSSREFS
KEYWORD
nonn,easy,base,less
AUTHOR
Vincenzo Librandi, Aug 21 2013
STATUS
approved