3294172

Appears in sequences

• Integers of the form Product p_j^k_j = Product k_j^p_j; p_j in A000040.at n=26A008478
• Triangle of coefficients in expansion of (1+7x)^n.at n=42A013614
• Triangle of coefficients in expansion of (4+7x)^n.at n=34A013625
• n is equal to the number of 5s in all numbers <= n written in base 7.at n=27A014889
• Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j).at n=38A027466
• a(n) = 7^(n-2) * C(n,2).at n=6A027474
• Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*4^j.at n=29A038270
• Numbers k such that if k = Product p_i^e_i then p_i = e_i for all i.at n=9A048102
• Triangle read by rows: T(n,k) = number of labeled endofunctions on n points with k fixed points.at n=38A055134
• Number of polynomial functions from Z to Z/nZ.at n=14A058067
• Write n in decimal, omit 0's, raise each digit k to k-th power and multiply.at n=27A061510
• a(n) = (n+1)^n*binomial(n+2,2).at n=6A081132
• Duplicate of A027474.at n=8A081137
• Numbers whose prime factors are raised to the powers of themselves.at n=4A113853
• Numbers of the form Product_i p_i^e_i, where the p_i are distinct primes and the e_i are a permutation of the p_i.at n=25A122406
• a(p_1^e_1*p_2^e_2*.....*p_m^e_m) = (p_1^p_1)^e_1*(p_2^p^2)^e_2*.....*(p_m^p_m)^e_m where p_1^e_1*p_2^e_2*.....*p_m^e_m is the prime decomposition of n.at n=13A133482
• Triangle: signed version of A055134.at n=38A137370
• A triangular sequence in which the Prime[n]^(2*n) is treated like a variable expansion: (1-Prime[n])^(2*n) with the base Prime[0] is defined as one (in the Goldbach tradition) to lower the coefficients: t(n,m)=(-1)^m*Prime[n]^(2*n - m)*Binomial[2*n, m].at n=18A141024
• Numbers that are products of distinct terms in A000312.at n=18A156223
• Integers that are half of their arithmetic derivatives.at n=6A165558