A046455 Concatenation of the 6 prime factors of composite a(n) is a palindrome.

64, 729, 15625, 99375, 117649, 272685, 525819, 570999, 1040655, 1058145, 1113879, 1229865, 1608285, 1742279, 1771561, 2006697, 2040423, 2262771, 2371551, 3101259, 3398759, 3599775, 4835523, 4963299, 5039685, 5495301

Offset: 1

Author

Patrick De Geest, Jul 15 1998

Keywords

• nonn
• base

Examples

			3398759 = 7 * 13 * 13 * 13 * 13 * 17 -> 71313131317 is palindromic.
		

Crossrefs

Cf. A046447.

Extensions

Edited by Charles R Greathouse IV, Apr 28 2010