19608

Appears in sequences

• Triangle of Gaussian binomial coefficients [ n,k ] for q = 7.at n=26A022171
• Triangle of Gaussian binomial coefficients [ n,k ] for q = 7.at n=22A022171
• Gaussian binomial coefficients [ n,5 ] for q = 7.at n=1A022234
• a(n) = (7^n - 1)/6.at n=6A023000
• Numbers k such that k^2 is palindromic in base 7.at n=44A029992
• a(n) = (n^7 - n)/42.at n=7A030180
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 35.at n=3A031713
• Number of sublattices of index n in generic 6-dimensional lattice.at n=6A038993
• Numbers that are repdigits in base 7.at n=31A048332
• Table in which n-th row gives all partitions of n interpreted in base n+1. (A subset of A051849 with each term having a non-descending digit-sequence in base n+1).at n=28A051851
• a(n) = 111111 in base n.at n=6A053700
• a(n) = (n^(n-1) - 1)/(n-1) for n>1, a(1) = 0.at n=6A060072
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,17.at n=8A064245
• 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=5.at n=6A068022
• Numbers of the form (7^{mr}-1)/(7^r-1) for positive integers m, r.at n=10A076286
• 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=15A096041
• Records in A104883.at n=23A104884
• Triangle read by rows: T(n,k) = value of the n-th repunit in base (k+1) representation, 1<=k<=n.at n=20A125118
• a(n) = floor(7^n/n).at n=5A129797
• a(n) = 1 + prime(n) + prime(n)^2 + prime(n)^3 + prime(n)^4 + prime(n)^5.at n=3A131993