115200

Appears in sequences

• Denominators of coefficients for repeated integration.at n=8A002689
• Numbers m such that uphi(sigma(m)) = 2m, where the unitary phi function (A047994) is defined by: if x = p1^r1*p2^r2*p3^r3*... then uphi(x) = (p1^r1 - 1)*(p2^r2 - 1)*(p3^r3 - 1)*...at n=13A030165
• Number of 3-fold-free subsets of {1, 2, ..., n}.at n=19A050293
• Sum of divisors of those numbers n such that n and n+1 have the same sum of divisors.at n=18A053215
• Sum of divisors of k such that k and k+1 have the same number and sum of divisors.at n=6A054005
• Triangle of numbers T(n,k) = T(n-1,k-1) + ((n+k-1)/k)*T(n-1,k), n >= 1, 1 <= k <= n, with T(n,1) = n!, T(n,n) = 1; read from right to left.at n=43A059369
• a(n) = (n-1)! + ((n+1)/2)*a(n-1), a(1)=0.at n=7A059371
• Number of seating arrangements for the ménage problem.at n=6A059375
• Triangle read by rows: T(n,k) = number of rational (+1,-1) matrices of rank k (n >= 1, 1 <= k <= n).at n=11A064231
• Denominators of coefficients in Airy-type asymptotic expansion.at n=0A069245
• 13-almost primes (generalization of semiprimes).at n=31A069274
• Sum of divisors of numbers containing in their decimal representation only the digits 0 and 1.at n=38A077810
• Triangle read by rows: T(m,k) = normalized partial derivative of (t,z) -> exp(t*g(z)) at (0,0), where 2*g(z) = 1 + exp(-2*z*g(z)).at n=19A078751
• Triangle T(n, k) read by rows. T(n, k) is the number of lists of k unlabeled permutations whose total length is n.at n=47A090238
• Numbers n which when converted to base 7, reversed and converted back to base 10 yield a number m such that n mod m = 0. Cases which are trivial or result in digit loss are excluded.at n=12A091081
• Triangle read by rows: T(n,k) is the number of permutations p of [n] in which the length of the longest initial segment avoiding both the 132- and the 231-pattern is equal to k.at n=50A092594
• Hook products of all partitions of 12.at n=7A093791
• Hook products of all partitions of 12.at n=8A093791
• Numbers containing squares of Pythagorean triples in their divisor set.at n=31A096472
• Inverse modulo 2 binomial transform of 7^n.at n=6A100740