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A109930
Least palindromic multiple of concatenation 1,2,3,...n-1,n,n-1,...3,2,1.
0
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.
EXAMPLE
a(5) = 1357997531= 11*123454321.
CROSSREFS
Sequence in context: A068838 A074256 A146312 * A309037 A013509 A013472
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Jul 18 2005
EXTENSIONS
More terms from Rick L. Shepherd, Jul 22 2005
STATUS
approved