1660725

Appears in sequences

• Odd numbers of the form p^(1+4k) * r^2, where p is prime of the form 1+4m, r > 1, and gcd(p,r) = 1 that are closer to being perfect than previous terms.at n=6A228059
• Primitive nondeficient numbers (A006039) that satisfy Euler's criteria for odd perfect numbers (A228058).at n=4A387709