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%I #10 Jul 01 2020 20:32:27
%S 1,2,6,66,2772,279972,67566576,5159488849515,83797355379738
%N Smallest palindrome in base 10 whose factorization contains n distinct base 10 palindromic prime factors.
%C For n <= 6, a(n) does not have a non-palindromic prime factor, i.e. a(n) has n distinct prime factors and they are all palindromes. On the other hand, a(7) contains a prime factor 13, which is not a palindrome.
%e a(6) = 67566576 = 2^4*3*7*11*101*181 has 6 distinct palindromic prime factors.
%Y Cf. A002113, A002385, A046385, A309565.
%K nonn,hard,base
%O 0,2
%A _Chai Wah Wu_, Jun 30 2020
%E a(8) from _David A. Corneth_, Jul 01 2020