56403

Appears in sequences

• a(1) = 0, a(2) = -2; for n > 2, a(n) + a(n-2) - a(n-3) - a(n-5) - ... - a(n-p) = (-1)^(n+1)*n if n is prime, otherwise = 0, where p = largest prime < n.at n=59A002120
• Numbers k such that k divides A109227(k); or k such that A109227(k) is a Niven number.at n=8A109228
• Real part of (3 + 2i)^n.at n=9A121622
• List of coprime pairs (x,y) such that x^2+y^2 = 13^n with 0<x<y.at n=18A158936
• Values of x such that x^2 + y^2 = 13^n with x and y coprime and 0 < x < y.at n=9A188948
• Odd numbers y such that x^2 + y^2 = 13^n with x and y coprime.at n=9A188983