78540

Appears in sequences

• a(n) = floor(n*(n-1)*(n-2)*(n-3)/16).at n=35A011926
• a(n) = floor(n(n-1)(n-2)(n-3)/18).at n=36A011928
• Numbers k such that phi(k) < k/5.at n=7A066765
• Numbers with six distinct prime divisors.at n=12A074969
• Numbers k such that 2k-1 divides 2^k-1.at n=32A081856
• Least common multiple of numbers obtained by adding one to the odd divisors of n and subtracting 1 from the even divisors of n.at n=35A086536
• Fifth column of the (1,4)-Pascal triangle A095666.at n=32A095667
• Smallest perimeter S such that exactly n distinct Pythagorean triangles with this perimeter can be constructed.at n=31A099830
• Sum of numbers under a triangle on a spiral staircase of width 10.at n=33A111080
• Related to enumeration of rooted catapolyoctagons (see Cyvin reference for precise definition).at n=13A121119
• Averages of twin prime pairs of A074378.at n=20A154563
• Numbers k such that bigomega(k)^omega(k) > k.at n=36A177871
• Exponential generating function is (1-x^1/1!)(1-x^2/2!)(1-x^3/3!)....at n=12A185895
• Numbers with prime factorization pqrstu^2.at n=1A189985
• Numbers k such that Euler phi(Dedekind psi(k)) > k.at n=3A196200
• 12 times the total number of smallest parts in all partitions of n, with a(0) = 0.at n=24A211609
• Degrees of irreducible representations of orthogonal group O10-(2).at n=38A214475
• Numbers n such that 2n-1 and 2n+1 divide 2^n-1.at n=12A233089
• Numbers k such that k+1, 2k+1, 3k+1, 4k+1 are all prime.at n=23A237189
• Number of 2 X 2 matrices with entries in {0,1,...,n} with determinant = permanent with no entries repeated.at n=35A280058