442368

Appears in sequences

• Numerator of frequency of integers with smallest divisor prime(n).at n=10A038110
• Orders of finite Abelian groups having the incrementally largest numbers of nonisomorphic forms (A046054).at n=19A046055
• a(n) = (3^3)*4^(n-3) with a(0)=1, a(1)=1 and a(2)=7.at n=10A056120
• Number of divisors of k as k runs through sequence of distinct values of LCM(1,..,n).at n=23A056795
• Numbers that are the product of their digits raised to positive integer powers.at n=28A059405
• a(n) = gcd(Phi(n!), Phi(n^n), Phi(lcm(1..n))).at n=17A064449
• Numbers n such that n=phi(n)*core(n) where phi(x) is the Euler totient function and core(x) the squarefree part of x (the smallest integer such that x*core(x) is a square).at n=34A069185
• 17-almost primes (generalization of semiprimes).at n=4A069278
• Denominator of Product{prime(k)^2/(prime(k)^2 - 1) | 0<k<=n}, Numerator: A072044.at n=6A072045
• Numbers k such that Sum_i ( e(i)/p(i) ) is an integer, where the prime factorization of k is Product_i ( p(i)^e(i) ).at n=31A072873
• Denominators in the Maclaurin series for arctan(1+x).at n=26A075554
• a(n) = denominator(n!/phi(n!)).at n=28A076359
• a(n) = denominator(n!/phi(n!)).at n=29A076359
• Three people (P1, P2, P3) are in a circle and are saying Hello to each other. They start with P2 saying "Hello, Hello". Thereafter Pn says "Hello" for n times the total number of Hello's so far.at n=12A076507
• a(1) = 1, a(n+1)= a(n)*(n+1) divided by the largest prime divisor of n+1.at n=19A076928
• Expansion of (1-x)/(1+2*x-2*x^2-2*x^3).at n=14A078053
• Third binomial transform of C(n+2,2).at n=8A081893
• Expansion of (1 - 2x + 2x^2 - x^3)/(1 - 2x)^2.at n=16A084860
• 3-smooth numbers whose arithmetic derivatives are also 3-smooth.at n=35A085256
• For each prime power n, a(n) is the number of positive integers that have n as their greatest prime power.at n=52A101207