
COMMENTS

Conjecture: No term is zero.
Leading zeros do not add to the digit count of a(n) but to the digitcount of the permutations. In a(5)=10007, the permutations 10007, 00107, 00017, 70001, 07001, 00701 and 00071 are all primes and their number is >=5.  R. J. Mathar, Feb 07 2008
In a variant where leading zeros may enhance the digit count of a(n), the sequence were 2, 13, 13, 13, 17, 17, 17, 17, 17, 17, 17, 17, 113, 113, 113,.... where 13 acts as a 2digit prime, as the 3digit prime 013 and as the 4digit prime 0013, generating 13, 31 and 103.  R. J. Mathar, Feb 07 2008
