6221671

Properties

Appears in sequences

• Euclid-Mullin sequence: a(1) = 2, a(n+1) is smallest prime factor of 1 + Product_{k=1..n} a(k).at n=7A000945
• Euclid-Mullin sequence (A000945) with initial value a(1)=43 instead of a(1)=2.at n=7A051318
• a(1)=2; thereafter a(n) = mpf(1+Product_{k=1..n-1} a(k)), where mpf(n) = f-th prime factor with multiplicity of n, for f=ceiling(bigomega(n)/2).at n=7A261564
• Start with k=2*n, and until k+1 is prime, apply the map k -> k*(least prime factor of (k+1)); then a(n) = k+1, or 0 if k+1 never reaches a prime.at n=42A288212
• Prime numbersat n=427010