170368

Appears in sequences

• a(n) = [ a(n-1)/a(1) ] + [ a(n-2)/a(2) ] + ... + [ a(1)/a(n-1) ], for n >= 3.at n=22A022858
• Numbers whose prime factors are 2 and 11.at n=32A033848
• Numbers of the form p^7*q^3 where p and q are distinct primes.at n=4A179705
• a(n) = floor(1/{(2+n^4)^(1/4)}), where {} = fractional part.at n=44A184537
• Permutation of natural numbers: a(n) = A270436(A007305(n+1)) * A270437(A047679(n-1)).at n=44A273671
• a(n) = Product_{d|n} (tau(d)*pod(d)) where tau(k) = the number of divisors of k (A000005) and pod(k) = the product of the divisors of k (A007955).at n=21A307101
• a(n) is the sum of the entries in an n X n X n 3D matrix whose elements start at 1 in the corner cells and increase by 1 with each step towards the center.at n=21A350236
• a(n) = Product_{k=2..n} k^ord(n, k) where ord(n, k) = 0 if k does not divide n, otherwise ord(n, k) = e where e is such that k^e divides n but k^(e + 1) does not.at n=43A364813