39509

Properties

Appears in sequences

• Numbers k that divide the (right) concatenation of all numbers <= k written in base 17 (most significant digit on left).at n=13A029462
• Numbers n such that 207*2^n-1 is prime.at n=25A050855
• Primes of the form 256 k + 85.at n=30A127593
• The lesser of twin primes p such that p*q+a+b+c are also the lesser of twin primes, (p and q are twin primes, p+2=q, a=p-1,b=(p+q)/2,c=q+1).at n=31A168536
• Number of (2+1) X (n+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.at n=40A258555
• Numbers n such that the Crandall number C = A262961(n) has exactly one prime divisor p >= n/2.at n=19A265079
• a(n) is the smallest prime p such that there is a multiplicative subgroup H of Z/pZ, of odd order and of index 2n, such that for any two cosets H1 and H2 of H, H1 + H2 contains all of (Z/pZ)\0, except that H+H contains all of (Z/pZ)\0 except -H. If no such prime exists, a(n) = 0.at n=33A294615
• Primes p such that p+2, (p^2-1)/2+p and (p^2+3)/2+3*p are also prime.at n=13A352948
• a(n) is the largest number of distinct integer-sided right triangles in which some n-digit number can appear as the length of a side.at n=9A354048
• First of three consecutive primes p, q, r such that p + q - r, p^2 + q^2 - r^2 and p^3 + q^3 - r^3 are all prime.at n=18A358744
• Prime numbersat n=4157