117810

Appears in sequences

• Denominator in Feinler's formula for unsigned Bernoulli number |B_{2n}|.at n=16A002444
• Denominators of Cauchy numbers of second type (= Bernoulli numbers B_n^{(n)}).at n=32A002790
• Denominators of Cauchy numbers of first type.at n=32A006233
• a(n) = 2*binomial(n,4).at n=36A034827
• a(n) is the smallest positive integer such that a(n)*(1^n + 2^n + ... + x^n) is a polynomial in x with integer coefficients.at n=32A064538
• Numbers k such that phi(k) < k/5.at n=13A066765
• Integers which have more than one coprime factorization into nonprime powers which sum to the same number.at n=9A072940
• One half of A075178.at n=32A075179
• a(n) = Sum_{i+j+k=n, 0<=i<=j<=k<=n} (2n)!/((i+j)! * (j+k)! * (k+i)!).at n=6A092473
• Triangle read by rows: T(n,k) is the number of set partitions of the set {1,2,...,n} containing k blocks of size 2 (0 <= k <= floor(n/2)).at n=39A124498
• Denominators of z-sequence for the Sheffer matrix (triangle) A094816 (coefficients of Poisson-Charlier polynomials).at n=32A130190
• Numbers n that raised to the powers from 1 to k (with k>=1) are multiple of the sum of their digits (n raised to k+1 must not be a multiple). Case k=11.at n=21A135196
• Numbers with prime factorization pqrstu^2.at n=7A189985
• Numbers k such that Euler phi(Dedekind psi(k)) > k.at n=7A196200
• Denominator of generalized Bernoulli number B_n^{(n-1)}.at n=30A260329
• Number of orbits of Aut(Z^7) as function of the infinity norm n of the representative lattice point of the orbit, when the cardinality of the orbit is equal to 80640.at n=35A266396
• G.f.: x^2 * f''(x), where f(x) = Product_{k>=1} 1 / (1 - x^k).at n=18A278406
• Numbers with a record number of deficient divisors.at n=29A335542
• a(n) is the least k such that there are exactly n divisors d of k for which k/d-d is prime.at n=18A340729
• Number of distinct regions among all circles that can be constructed on vertices of an n-sided regular polygon, using only a compass.at n=29A359046