A046456 Concatenation of the 7 prime factors of composite a(n) is a palindrome.

128, 2187, 78125, 496875, 823543, 1908795, 3680733, 6280989, 11447205, 11639595, 14480427, 15839397, 15988245, 17998875, 19165069, 19487171, 22073667, 22444653, 27340845, 30830163, 35277795, 38975433, 44183867

Offset

1,1

Links

Table of n, a(n) for n=1..23.

Example

17998875 = 3 * 3 * 3 * 5 * 5 * 5 * 5333 -> 3335555333 is palindromic.

Crossrefs

Cf. A046447.

Sequence in context: A351605 A343287 A113852 * A092759 A056574 A096961

Adjacent sequences: A046453 A046454 A046455 * A046457 A046458 A046459

Keyword

nonn,base

Author

Patrick De Geest, Jul 15 1998

Extensions

Edited by Charles R Greathouse IV, Apr 28 2010

Status

approved