413343

Appears in sequences

• Denominators of coefficients of Green function for cubic lattice.at n=5A003302
• Numbers that are the sum of 7 positive 10th powers.at n=35A004807
• a(n) = 7*3^n.at n=10A005032
• Numbers of form 7^i*9^j, with i, j >= 0.at n=26A025631
• Numbers k that divide the (right) concatenation of all numbers <= k written in base 9 (most significant digit on left).at n=38A029454
• Numbers whose prime factors are 3 and 7.at n=30A033850
• Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*9^j.at n=30A038227
• Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*3^j.at n=33A038293
• Smallest lucky number that is the product of n lucky numbers.at n=9A064703
• Smallest lucky number that is the product of n lucky numbers.at n=10A064703
• Values of x in positive integer solutions of x^2 + y^5 = z^3, listed in increasing order of z. (If a z-value occurs twice, list solutions in increasing order of y.)at n=17A070065
• Smallest k > n such that there are exactly n pairs (x,y) (1 <= x <= y <= k) solutions of the equation: phi(xy)=sigma(x)+sigma(y).at n=38A071780
• Coefficient of the highest power of q in the expansion of nu(0)=1, nu(1)=b and for n >= 2, nu(n) = b*nu(n-1) + lambda*(n-1)_q*nu(n-2) with (b,lambda)=(2,3), where (n)_q = (1+q+...+q^(n-1)) and q is a root of unity.at n=22A072985
• a(n) = (7*3^n - 4*0^n)/3.at n=11A082541
• Duplicate of A082541.at n=11A083596
• a(n) = 3*a(n-1) for n>2; a(0)=1, a(1)=3, a(2)=7.at n=12A141495
• a(n) = 3*a(n-2) for n > 2; a(1) = 1; a(2) = 7.at n=21A166481
• Least term of A094179 with exactly 2n divisors.at n=10A204046
• Least term of A004767 with exactly 2n divisors.at n=10A204086
• a(n+2) = 3*a(n), starting 4,7.at n=21A228879