2441406

Appears in sequences

• a(n) = (5^n - 1)/4.at n=10A003463
• Gaussian binomial coefficients [ n,9 ] for q = 5.at n=1A022216
• Number of sublattices of index n in generic 10-dimensional lattice.at n=4A038997
• Numbers that are repdigits in base 5.at n=37A048330
• 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=9.at n=4A068026
• Numbers of the form (5^{mr}-1)/(5^r-1) for positive integers m, r.at n=23A076284
• Triangle read by rows: T(n,k) = (n+1,k)-th element of (M^5-M)/4, where M is the infinite lower Pascal's triangle matrix, 1<=k<=n.at n=45A096039
• a(n) = n^9 + n^8 + n^7 + n^6 + n^5 + n^4 + n^3 + n^2 + n + 1.at n=5A103623
• a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 11.at n=4A160957
• Dispersion of A016861, (5k+1), by antidiagonals.at n=45A191703
• Expansion of x*(1+5*x-5*x^3)/(1-6*x^2+5*x^4).at n=18A249222
• a(n) = (5^(2*(n + 1)) - 1)/4.at n=3A275766
• Oblong numbers m such that beta(m) = tau(m)/2 where beta(m) is the number of Brazilian representations of m and tau(m) is the number of divisors of m.at n=5A326385