50811

Appears in sequences

• Number of n-digit twin prime pairs.at n=6A070076
• Least k such that Sum_{i=1..k} 1/phi(i) >= n.at n=20A074467
• Numbers n such that m=(n^2+1)/2, p=(m^2+1)/2 and q=(p^2+1)/2 are all prime.at n=26A188546
• Semiprimes p*q such that p*q+p+q, p*q-(p+q), p*q+2*(p+q) and p*q-2*(p+q) are all primes.at n=34A356765
• Maximal coefficient of (1 + x) * (1 + x^16) * (1 + x^81) * ... * (1 + x^(n^4)).at n=36A359320