1275120

Appears in sequences

• Denominator of Sum_{k=1..n} 1/phi(k).at n=47A048049
• a(n) = lcm{ phi(1), ..., phi(n) }, where phi is Euler's totient function A000010.at n=46A051547
• a(n) = lcm{ phi(1), ..., phi(n) }, where phi is Euler's totient function A000010.at n=47A051547
• a(n) = lcm{ phi(1), ..., phi(n) }, where phi is Euler's totient function A000010.at n=48A051547
• Number of labeled pure 2-complexes on n nodes (0-simplexes) with 5 2-simplexes and 8 1-simplexes.at n=19A054559
• a(n) = lcm{prime(i)-1, i=1..n}.at n=15A058254
• Distinct values of lcm_{i=1..n} (p(i)-1), where p() are the primes.at n=9A058255
• Distinct values arising in A051547, sequence of a(n) = lcm(phi(1), ..., phi(n)).at n=10A076244
• Period of reciprocal of the primorials.at n=13A092281
• Triangle read by rows: T(n, k) = binomial(n, k)/Beta(n+1, n-k+1) + binomial(n, n-k)/Beta(n+1, k+1).at n=38A156052
• Triangle read by rows: T(n, k) = binomial(n, k)/Beta(n+1, n-k+1) + binomial(n, n-k)/Beta(n+1, k+1).at n=42A156052
• a(n) = (n + 4)*(n + 3)*(n + 2)*(n + 1)*n / 5 = 24*A000389(n+4).at n=21A158874
• Square array read by antidiagonals: T(n,k) is the number of k-edge colored trees on vertex set [n] (n>=2, k>=2).at n=32A248090
• Least common multiple of all n - d, where d < n and d is a divisor of n.at n=23A258324
• Number of elements of order n in simple Mathieu group M_23.at n=7A284872
• a(n) = Product_{d|n, d-1 is prime} (d-1)^(1+A286561(n,d-1)), where A286561(n,k) gives the k-valuation of n (for k > 1).at n=23A323155