266400

Appears in sequences

• Sum_{k <= 10^n} number of distinct primes dividing k (A001221).at n=5A064182
• a(n) = floor(1/(n-1) * Sum_{k=1..n-1} a(k)^(n/k)), given a(0)=1, a(1)=2, a(2)=3.at n=20A079116
• Numbers k such that k+1 is a prime, k+2 is twice a prime, k+3 is three times a prime, and k+4 is four times a prime.at n=10A278585