A031880 Lucky numbers that are both palindromic and nonprime.

1, 9, 33, 99, 111, 141, 171, 303, 393, 535, 717, 777, 979, 1441, 1771, 3003, 3223, 3663, 5335, 7447, 9009, 9339, 9999, 11011, 11811, 11911, 12121, 12321, 12621, 13531, 14041, 14541, 14841, 17671, 18381, 18681, 19791, 30303, 31713, 32223

Offset: 1

Author

Patrick De Geest

Keywords

• nonn
• base

Links

• Amiram Eldar, Table of n, a(n) for n = 1..5436 (terms below 10^9)

Crossrefs

Intersection of A000959 and A032350.

Extensions

Name corrected by Amiram Eldar, Nov 15 2019