A046449 Smallest composite number with n distinct prime factors with property that the concatenation of its distinct prime factors is a palindrome.

4, 39, 429, 5565, 94605, 1040655, 2332655745, 178516966485, 4105890229155, 867388559982945, 37297708079266635, 1529206031249932035

Offset

1,1

Comments

Subsequence of A046447. - Michel Marcus, Dec 06 2014

Links

Table of n, a(n) for n=1..12.

Example

a(5)=94605 has 5 distinct factors 3 * 5 * 7 * 17 * 53 and 3571753 is palindromic.

Crossrefs

Cf. A046447, A046448, A046450.

Sequence in context: A241075 A123618 A199757 * A203211 A214823 A275517

Adjacent sequences: A046446 A046447 A046448 * A046450 A046451 A046452

Keyword

nonn,hard,nice,base

Author

Patrick De Geest, Jul 15 1998

Extensions

More terms from Arlin Anderson (starship1(AT)gmail.com), Mar 11 2000

Status

approved