20057

Appears in sequences

• a(n) = floor(n*(n-1)*(n-2)*(n-3)/21).at n=27A011931
• a(n) = position of n^3 + (n+1)^3 + (n+2)^3 in A024975.at n=39A024980
• Numbers n such that there is an integer k with the property that k^tau(n) = sigma(n).at n=14A225239
• Number of length n+2 0..5 arrays with no three unequal elements in a row and no three equal elements in a row and new values 0..5 introduced in 0..5 order.at n=11A243724
• Semiprimes that are the sum of the first n odd primes for some n.at n=29A274182