153125

Appears in sequences

• Numbers of the form 5^i*7^j with i, j >= 0.at n=30A003595
• Numbers whose prime factors are 5 and 7.at n=16A033851
• Numbers n such that n | 9^n + 8^n + 7^n + 6^n + 5^n.at n=38A057253
• Hypotenuses for which there exist exactly 5 distinct Pythagorean triangles.at n=31A084649
• Product of the 5th power of a prime and different distinct prime of the 2nd power (p^5*q^2).at n=30A179646
• Numbers n such that psi(n) = 2*phi(n).at n=43A292390
• a(n) is the conjectured largest number such that both a(n) and a(n) - n are 7-smooth numbers. a(n) can be less than n. Otherwise, if no such number exists then a(n) = 0.at n=34A376924
• Powerful numbers k that are not prime powers such that there exist no numbers m such that rad(m) | k and Omega(m) > Omega(k), where rad = A007947 and Omega = A001222.at n=35A377591
• Odd numbers of the form p^(1+4k) * r^2, where p is prime of the form 1+4m, k > 0, r > 1, and gcd(p,r) = 1.at n=1A386428