488281

Appears in sequences

• a(n) = (5^n - 1)/4.at n=9A003463
• Gaussian binomial coefficients [ n,8 ] for q = 5.at n=1A022215
• Number of sublattices of index n in generic 9-dimensional lattice.at n=4A038996
• Numbers that are repdigits in base 5.at n=33A048330
• 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=4A068025
• Numbers of the form (5^{mr}-1)/(5^r-1) for positive integers m, r.at n=20A076284
• 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=36A096039
• a(n) = (Sum_{i=0..n} 5^i) + 1 - (Sum_{i=0..n} 5^i) mod 2.at n=8A102239
• a(n) = Sum_{j=0..8} n^j.at n=5A102909
• Triangle T(n, m) = T(n-1, m-1) + (4m-3)*T(n-1, m) read by rows 1<=m<=n.at n=46A111578
• Riordan array (1/sqrt(1-6x+5x^2),x/(1-6x+5x^2)).at n=46A111965
• Triangle read by rows: T(n,k) = value of the n-th repunit in base (k+1) representation, 1<=k<=n.at n=39A125118
• a(n) = (5^n - 1)/(2^(3 - (n mod 2))).at n=9A152417
• a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 10.at n=4A160953
• Dispersion of A016861, (5k+1), by antidiagonals.at n=36A191703
• a(n) = sigma(n^4).at n=24A202994
• Expansion of x*(1+5*x-5*x^3)/(1-6*x^2+5*x^4).at n=16A249222
• Square array T(n,k) read by antidiagonal upwards in which column k lists the partial sums of the powers of the k-th prime, n >= 0, k >= 1.at n=57A319076
• Centered 10-gonal numbers which are sphenic numbers.at n=32A368426
• a(n) = sigma_1(n) * sigma_3(n).at n=24A379813