476100

Appears in sequences

• Numbers k such that the numerator of Sum_{d|k} 1/d > 3*k.at n=23A069096
• Initial values for f(x)=phi(sigma(x)) such that iteration of f ends in a cycle of length 18.at n=6A096890
• Square perimeters of primitive Pythagorean triangles.at n=24A120089
• a(1)=1; at n>=2, a(n) = least square > a(n-1) such that sum a(1)+...+a(n) is a prime number.at n=32A139033
• Squares of Bernoulli number denominators A027642.at n=44A172282
• Numbers with prime factorization p^2*q^2*r^2*s^2 where p, q, r, and s are distinct primes.at n=7A190377
• Number of (w,x,y,z) with all terms in {1,...,n} and w<=2x and y<=2z.at n=30A212506
• Composite numbers whose number of proper divisors has a number of proper divisors which has a prime number of proper divisors.at n=15A223457
• Number of (n+2) X (7+2) 0..1 arrays with no 3 X 3 subblock diagonal sum less than the antidiagonal sum or central row sum less than the central column sum.at n=21A258893
• Numbers k such that sigma(k) - 3k is prime.at n=8A306492
• Numbers having exactly four non-unitary prime factors.at n=22A338541
• a(n) is the smallest nonnegative integer k where exactly n pairs of positive integers (x, y) exist such that x^2 + 11*y^2 = k.at n=13A374160