OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..5000
EXAMPLE
E.g. 46 is not prime and 4+6 =10 is also not prime.
MATHEMATICA
Select[Rest[FromDigits/@Tuples[{0, 1, 4, 6, 8, 9}, 3]], !PrimeQ[ Total[ IntegerDigits[ #]]]&] (* Harvey P. Dale, Jul 20 2017 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 27 2003
STATUS
approved