1432080

Appears in sequences

• a(n) = -Product_{k=0..n} (7*k-1); sept-factorial numbers.at n=5A049209
• Smallest k such that d(phi(k)) - phi(d(k)) = -n, where d(k) = A000005(k) and phi(k) = A000010(k).at n=14A078151
• Septuple factorial, 7-factorial, n!7, n!!!!!!!, a(n) = n*a(n-7) if n > 1, else 1.at n=34A114799
• Largest k such that k <= 81*(number of digits of k^n)*(number of digits of k^(n+1)).at n=20A130179
• Triangle sequence: T(n, k) = -Product_{j=0..k+1} ((n+1)*j - 1).at n=25A153187
• Triangle read by rows: T(n,k) = Product_{i=0..k-2} (i*n + n - 1).at n=19A153273