52537

Appears in sequences

• Numbers n such that sigma_3(n) is divisible by square of cototient of n, while n is not a prime number.at n=23A091286
• Number of compositions of n with first part 4 and no equal adjacent parts; this is column 4 of the array in A096568.at n=24A096572
• Composite numbers k for which k - phi(k) divides k-1.at n=16A160599
• Expansion of e.g.f. exp( x/(1-x)^2 ) / (1-x).at n=6A361598
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,k) = n! * Sum_{j=0..n} binomial(n+(k-1)*j,k*j)/j!.at n=42A361600