A046410 Palindromes with exactly 4 distinct palindromic prime factors.
6666, 22888822, 66888866, 413979314, 2228668222, 2668668662, 2888668882, 3315115133, 6668228666, 200446644002, 222266662222, 222446644222, 224488884422, 228866668822, 244666666442, 246664466642, 246686686642
Offset: 1
Extensions
a(10)-a(17) from Donovan Johnson, Jul 20 2010