A109930 Least palindromic multiple of concatenation 1,2,3,...n-1,n,n-1,...3,2,1.

2, 242, 24642, 2468642, 1357997531, 1123454543211, 112345656543211, 11234567676543211, 1123456787876543211, 112345678989876543211, 1122345678989898765432211, 11223345678989898987654332211

Offset

1,1

Comments

If c represents the concatenation then a(n) = m*c where m > 1.

Links

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

Example

a(5) = 1357997531= 11*123454321.

Crossrefs

Sequence in context: A068838 A074256 A146312 * A309037 A013509 A013472

Adjacent sequences: A109927 A109928 A109929 * A109931 A109932 A109933

Keyword

base,nonn

Author

Amarnath Murthy, Jul 18 2005

Extensions

More terms from Rick L. Shepherd, Jul 22 2005

Status

approved