70100

Appears in sequences

• Number of quadruples [i,j,k,l] with all entries between 1 and n such that gcd(i,j) = gcd(k,l).at n=19A124162
• Numbers k such that k and k^2 use only the digits 0, 1, 4, 7 and 9.at n=36A136865
• a(n) = sum of the squares of the coefficients of x^(2k) in A(x^2)^{2*(n-2k)+1}, as k varies from 0 to floor(n/2), with a(0)=1.at n=9A162249
• Number of strings of numbers x(i=1..n) in 0..3 with sum i^3*x(i) equal to n^3*3.at n=16A184251