56857

Properties

Appears in sequences

• Primes of the form 2*x^3 + 3*x^2 + 5*x + 7.at n=8A078625
• Integers n such that n is prime and x is prime, where (x,y) is the smallest solution to the Pell equation with D = n.at n=34A109748
• Primes p such that 2*p^4+-9 are also prime.at n=29A174365
• Number of (n+4) X 6 binary arrays with every 5 X 5 subblock commuting with each horizontal and vertical neighbor 5 X 5 subblock.at n=12A186602
• 9*n analog to Keith numbers.at n=20A282764
• Primes equal to an octagonal number plus 1.at n=26A285792
• Smallest prime p == 1 (mod 8) such that Q(sqrt(p)) has class number 2n+1.at n=14A355876
• Smallest p == 1 (mod 4) such that Q(sqrt(p)) has class number 2n+1.at n=14A355878
• Primes p such that p^2 + 1 has more divisors than p^2 - 1.at n=37A358879
• Primes having only {5, 6, 7, 8} as digits.at n=30A386196
• Prime numbersat n=5765