184320

Appears in sequences

• Product of totient function: a(n) = Product_{k=1..n} phi(k) (cf. A000010).at n=11A001088
• Denominators of coefficients of expansion of Bessel function J_2(x).at n=3A002506
• Smallest number with 2n divisors.at n=38A003680
• Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j)*8^j.at n=18A038262
• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*6^j.at n=17A038284
• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*9^j.at n=16A038287
• Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*8^j.at n=19A038298
• Least number with exactly n divisors that are at most its square root.at n=38A038549
• Expansion of e.g.f. x^2/(1-4*x).at n=6A052670
• Denominator of beta(2n+1)/Pi^(2n+1), where beta(m) = Sum_{k=0..inf} (-1)^k/(2k+1)^m.at n=3A053005
• Triangle of coefficients of x^2 in the Neumann polynomials.at n=21A057869
• Factorial splitting: write n! = x*y*z with x<y<z and x maximal and z is minimal; sequence gives value of z-x.at n=23A061033
• Smallest integer with A002191(n) divisors, i.e., the number of divisors equals the sum of the divisors of a different number.at n=33A061072
• Least number whose number of divisors is A007304(n) (the n-th number that is the product of 3 distinct primes).at n=4A061299
• a(n) = tau( sigma_n(n) ), where tau is the number of divisors of n.at n=32A064165
• a(0) = 2, a(n) = 2^(n+1)*(n-1)! (n >= 1).at n=7A064378
• Product of nonzero digits of A066551(n).at n=14A066583
• a(n) = Product_{i=2..n} phi(i)/bigomega(i).at n=12A066988
• Numbers k such that k = phi(sigma(phi(sigma(k)))).at n=22A067883
• Denominator of S(n)/Pi^n, where S(n) = Sum((4k+1)^(-n),k,-inf,+inf).at n=6A068205