232897

Appears in sequences

• Composite numbers whose prime factors have no digits other than 7's and 9's.at n=30A036324
• Positive numbers y such that y^2 is of the form x^2+(x+16807)^2 with integer x.at n=22A156713
• Numbers k dividing u(k), where the Lucas sequence is defined u(i) = u(i-1) - 2*u(i-2) with initial conditions u(0)=0, u(1)=1.at n=10A228439
• Number of 2 X 2 matrices having all elements in {-n,..,0,..,n} with determinant = permanent.at n=24A280059
• Odd numbers k, not powers of primes, such that sigma(k) == 2 modulo 8 and sigma(sigma(k)) == 6 modulo 8.at n=37A332458