319489

Properties

Appears in sequences

• Prime factors of Fermat numbers.at n=8A023394
• a(n) = T(5,n), array T given by A048472.at n=13A048477
• a(n) = T(n,n), array T given by A048472.at n=12A048482
• Smallest prime factor of the n-th Fermat number F(n) = 2^(2^n) + 1.at n=11A093179
• Squarefree products of factors of Fermat numbers (A023394).at n=29A094358
• Anti-elite primes: a prime number p is called anti-elite if only a finite number of Fermat numbers 2^(2^n)+1 are quadratic non-residues mod p.at n=22A128852
• Number of (n+2) X 6 binary arrays with every 3 X 3 subblock commuting with each horizontal and vertical neighbor 3 X 3 subblock.at n=26A190028
• Divisors of Fermat numbers.at n=9A307843
• Primes congruent to 1 (mod 3) that divide some Fermat number.at n=1A351332
• Numbers k that divide 2^(2^k) - 2^k + 1.at n=15A373580
• Primes p such that there exists a cyclic permutation of the nonzero residues modulo p such that v^2 - 4*u*w == 0 (mod p) for any three consecutive residues u,v,w.at n=19A376008
• Prime numbersat n=27567