6725601

Appears in sequences

• Gaussian binomial coefficients [ n,8 ] for q = 7.at n=1A022237
• a(n) = (7^n - 1)/6.at n=9A023000
• Number of sublattices of index n in generic 9-dimensional lattice.at n=6A038996
• Z(S_m; sigma[1](n), sigma[2](n),..., sigma[m](n)) where Z(S_m; x_1,x_2,...,x_m) is the cycle index of the symmetric group S_m and sigma[k](n) is the sum of k-th powers of divisors of n; m=8.at n=6A068025
• Numbers of the form (7^{mr}-1)/(7^r-1) for positive integers m, r.at n=20A076286
• Triangle read by rows: T(n,k) = (n+1,k)-th element of (M^7-M)/6, where M is the infinite lower Pascal's triangle matrix, 1<=k<=n.at n=36A096041
• a(n) = (1/6) * (7^(n+1) - 3*(-1)^n + 2).at n=8A102303
• a(n) = Sum_{j=0..8} n^j.at n=7A102909
• Triangle read by rows: T(n,k) = value of the n-th repunit in base (k+1) representation, 1<=k<=n.at n=41A125118
• a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 10.at n=6A160953
• Sum n^k, k=0..n+1.at n=6A173468