Least palindromic multiple of concatenation n,n-1,...,3,2,1,2,3,...,n-1,n, or zero if no such multiple exists. a(n) is not equal to n.

A109931

Least palindromic multiple of concatenation n,n-1,...,3,2,1,2,3,...,n-1,n, or zero if no such multiple exists. a(n) is not equal to n.