86640

Appears in sequences

• a(n) = n^3 * Product_{p|n, p prime} (1 + 1/p).at n=37A033196
• Variance of time for a random walk starting at 0 to reach one of the boundaries at +n or -n for the first time.at n=19A072819
• Product of product of divisors of n and sum of divisors of n.at n=37A076722
• Number of (w,x,y,z) with all terms in {0,...,n} and (least gapsize)=1.at n=25A212894
• a(n) = 54*n^2 + 6*n.at n=40A277990
• Coefficients in q-expansion of (3*E_2*E_4 - 2*E_6 - E_2^3)/1728, where E_2, E_4, E_6 are the Eisenstein series shown in A006352, A004009, A013973, respectively.at n=38A282097
• Numerators of the fractions a(0)/(a(1) - a(0)), a(1)/(a(2) - a(1)), a(2)/(a(3) - a(2)), ... such that the sum 1/a(0) + Sum_{n>=1} a(n-1)/(a(n) - a(n-1)) has the concatenation of these numerators as decimal part. Case a(0) = 3.at n=2A320306
• Number of new terms added at n-th generation of A306211.at n=26A323475
• Maximum number of copies of a 1234 permutation pattern in an alternating (or zig-zag) permutation of length n + 5.at n=35A338429
• Numbers k such that k and k+2 are both unitary untouchable numbers (A063948).at n=9A357323
• The Dedekind psi function value of the smallest cube divisible by n.at n=37A392169
• The Dedekind psi function value of the smallest cubefull number that is a multiple of n.at n=37A392171