139283

Appears in sequences

• Number of primes <= n-th Lucas number.at n=30A277062
• 2*a(n) is the least number where k sets a new record such that 2*a(n)-k and 2*a(n)+k are prime and at least one of 2*a(n)-j and 2*a(n)+j is composite for all 0<j<k.at n=29A307881