245768

Appears in sequences

• Numbers k such that sigma(k)*omega(k) = sigma(k+1)*omega(k+1), where omega(k) is the number of distinct prime divisors of n (A001221).at n=23A063071
• 2^(n-1) times coefficient of x in (1+x)^n mod U(n,x), U the Chebyshev polynomials.at n=14A099590
• Number of solutions to x^2 + y^2 + z^2 + t^2 == n (mod 2*n) for x,y,z,t in [0, 2*n).at n=30A229294