OFFSET
1,1
COMMENTS
None of the prime factors of a(n) are a substring of a(n) and at least one of the digits of the prime factors of a(n) appears in a(n).
EXAMPLE
51 = 3*17 -> digit 1 appears in 5{1}.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Aug 15 1999
STATUS
approved