38086

Appears in sequences

• a(n) = 2*prime(n)*prime(n+1).at n=32A069486
• Numbers n such that sum of distinct primes dividing n is divisible by the largest prime dividing n. Also n is neither a prime, nor a true power of prime and n is squarefree. Squarefree solutions of A071140.at n=33A071141
• Numbers of the form 2*p*q where (p,q) is a twin prime pair.at n=10A071142
• Squarefree numbers k such that the largest prime factor of k is equal to the sum of the other prime factors of k.at n=32A071312
• Numbers k = p*q*r (p, q, r prime) congruent to 0 mod p+q+r.at n=34A160394
• Squarefree numbers which yield zero when their prime factors are xored together.at n=20A235488
• a(0)=0, a(1)=1, a(n) = min{5 a(k) + (5^(n-k)-1)/4, k=0..(n-1)} for n>=2.at n=22A259669
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 221", based on the 5-celled von Neumann neighborhood.at n=37A270936
• a(n) is the largest integer x such that x/sopf(x) = prime(n) where sopf(x) is the sum of distinct prime factors of x and prime(n) is the n-th prime.at n=32A336493
• a(1) = 12; for n >= 2, a(n) = least positive integer of the form prime(m)*prime(n-m)*prime(n) with m >= 1.at n=33A364434