52710

Appears in sequences

• Numbers k having exactly 5 distinct prime factors, the largest of which is greater than or equal to sqrt(k) (i.e., sqrt(k)-rough numbers with exactly 5 distinct prime factors).at n=7A115959
• Number of nonnegative integers with property that their base 5/3 expansion (see A024633) has n digits.at n=19A245418
• Poincaré series for hyperbolic reflection group with Coxeter diagram shown in Comments.at n=15A265052
• Number of permutations of n elements in which alternating maximal rises and descents are all of length >= 2.at n=10A277556
• G.f.: Sum_{n>=1} Sum_{k=0..n} binomial(n,k) * x^(k^2) * (x^n - x^k)^(n-k), ignoring the constant term.at n=68A292808
• Sum of the areas of the distinct rectangles (and the areas of the squares on their sides) with positive integer sides such that L + W = n, W < L.at n=41A294139
• a(n) = Sum_{k=1..n} sigma( (n/gcd(k,n))^2 ).at n=35A372227
• Products of 5 distinct primes that are sandwiched between twin prime numbers.at n=37A376380