176419

Properties

Appears in sequences

• Eisenstein-Mersenne primes: primes of the form ((3 +/- sqrt(-3))/2)^p - 1.at n=3A066413
• Larger member of twin prime pairs whose sum is a square.at n=16A118593
• Number of semiprimes among n-th million natural numbers.at n=25A216593
• a(n) = 3^(2*n+1) - 3^(n+1) + 1: The left Aurifeuillian factor of 3^(6*n+3) + 1.at n=5A220978
• Twin prime pairs which sum to perfect squares.at n=33A232878
• Primes prime(k) such that 2*(prime(k)^2 - prime(k-1)^2) is a perfect square.at n=38A335410
• Primes of the form (p^2+p+1)/3 where p is prime.at n=18A338299
• Prime numbersat n=16034