28537

Properties

Appears in sequences

• Initial term in sequence of four consecutive primes separated by 3 consecutive differences each <=6 (i.e., when d=2,4 or 6) and forming d-pattern=[4, 6, 2]; short d-string notation of pattern = [462].at n=33A078851
• Primes p(x) satisfying the following conditions: (a) A082882(x)=1; (b) {p(x),p(x+1)} are not twin primes; (c) values of A075860(j) for j composites between these two non-twin primes are identical.at n=12A082883
• Primes p such that the sum of the digits of p is not prime, but the sum of each digit raised to the 4th power is prime.at n=27A091368
• List of primitive prime divisors of the numbers (3^k-1)/2 (A003462) for k>=2, in order of their occurrence.at n=39A129733
• Number of length-4 0..n arrays with no repeated value differing from the previous repeated value by one.at n=11A269495
• Number of nX4 0..1 arrays with no 1 equal to more than one of its horizontal, vertical and antidiagonal neighbors.at n=4A282858
• Number of nX5 0..1 arrays with no 1 equal to more than one of its horizontal, vertical and antidiagonal neighbors.at n=3A282859
• T(n,k)=Number of nXk 0..1 arrays with no 1 equal to more than one of its horizontal, vertical and antidiagonal neighbors.at n=31A282862
• T(n,k)=Number of nXk 0..1 arrays with no 1 equal to more than one of its horizontal, vertical and antidiagonal neighbors.at n=32A282862
• Primes p such that A001414(p+q) is the square of a prime, where q is the next prime after p.at n=46A342830
• Primes p whose reverse q is a semiprime, and of p+q and its reverse one is a prime and the other is a semiprime.at n=40A350781
• a(n) = 25*n^2/2 - 11*n/2 + 1.at n=48A383465
• Prime numbersat n=3103