93186

Appears in sequences

• a(n) is the smallest value of k such that number of non-unitary prime divisors of k-th Catalan number, A000108(k) = C(2*k,k)/(k+1) equals n.at n=44A081395
• Least k > 1 such that phi(k*n-1) = phi(k*n+1), or -1 if no such k exists.at n=31A276052
• Least k such that phi(k*n-1) = phi(k*n+1), or -1 if no such k exists.at n=31A276373
• Number of aperiodic toroidal necklaces of positive integers summing to n.at n=19A323866