3680733

Appears in sequences

• Concatenation of the 7 prime factors of composite a(n) is a palindrome.at n=6A046456
• Square array T(n,k) read by ascending antidiagonals: T(n,k) = (p - 1)/2*(2*(n - 1)*p^(n - 1) - (2*n - 3)*p^(n - 2)), n>=2, where p is the k-th odd prime.at n=30A391520