25307

Properties

Appears in sequences

• Primes that remain prime through 3 iterations of function f(x) = 6x + 7.at n=21A023289
• Primes of the form 666*k - 1.at n=13A063472
• Largest prime factor of 3^n+2.at n=11A080443
• a(n) = n*(n^2 - 1)/2 - 1.at n=35A117560
• Prime quadruples: 3rd term.at n=21A136721
• a(n) is n-th prime == -1 (mod 6n).at n=37A138905
• Number of ways to place zero or more nonadjacent 2,0 3,1 4,2 4,3 4,4 5,2 6,2 7,2 polyhexes in any orientation on a planar nXnXn triangular grid.at n=8A155448
• a(n) = Sum_{y=1..n} Sum_{x=1..n} floor((x^k + y^k)^(1/k)) with k = 2.at n=31A211791
• Upper twin prime-indexed primes in the sequence of prime(prime(i)).at n=3A228055
• Number of 2 X n 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=19A241256
• Primes p such that (p^2+2)/3 and (p^4+2)/3 are prime.at n=22A256811
• Primes p such that 2*p + 11 is a square.at n=33A269784
• Primes p such that p^7 - 1 has 8 divisors.at n=18A341669
• Prime numbersat n=2791