21875

Appears in sequences

• Numbers of the form 5^i*7^j with i, j >= 0.at n=22A003595
• a(n) = 7*5^n.at n=5A005055
• Triangle of coefficients in expansion of (1+5x)^n.at n=32A013612
• Triangle of coefficients in expansion of (5+7x)^n.at n=16A013626
• Numbers k that divide s(k), where s(1)=1, s(j)=21*s(j-1)+j.at n=37A014872
• Weight distribution of [50,21,12] code associated with Hoffman-Singleton and Higman-Sims graphs.at n=17A015064
• Weight distribution of [50,21,12] code associated with Hoffman-Singleton and Higman-Sims graphs.at n=8A015064
• Weight distribution of [50,22,7] code associated with Hoffman-Singleton and Higman-Sims graphs.at n=16A015066
• Weight distribution of [50,22,7] code associated with Hoffman-Singleton and Higman-Sims graphs.at n=34A015066
• a(n) = (2*n - 15)*n^2.at n=25A015247
• The sequence M(n) in A022905.at n=33A022908
• a(n) = 10^n - n^7.at n=5A024121
• Numbers k that divide the (right) concatenation of all numbers <= k written in base 5 (most significant digit on left).at n=23A029450
• Numbers whose prime factors are 5 and 7.at n=10A033851
• Composite numbers whose prime factors contain no digits other than 5 and 7.at n=30A036320
• Triangle whose (i,j)-th entry is 5^(i-j)*binomial(i,j).at n=31A038243
• Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*5^j.at n=19A038271
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n+1)/3.at n=22A048040
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n+2)/3.at n=22A048073
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n+3)/3.at n=22A048084