1647085

Appears in sequences

• a(n) = 2*n^n-1.at n=7A062207
• Numbers of the form i*7^j-1 (i=1..6, j >= 0).at n=43A181303
• a(n) = 2*7^n - 1.at n=7A198480
• a(n) = Sum_{1 <= x_1, x_2, ... , x_n <= n} gcd(x_1, x_2, ... , x_n, n)^n.at n=6A372939