274177

Properties

Appears in sequences

• Smallest prime factor of 2^n + 1.at n=63A002586
• Prime factors of Fermat numbers.at n=7A023394
• Triangle in which n-th row gives prime factors of n-th Fermat number 2^(2^n)+1.at n=7A050922
• Smallest prime factor of n^n + 1.at n=15A055385
• Smallest factor of (2n)^(2n) + 1.at n=7A055386
• Duplicate of A050922.at n=7A067387
• Lesser prime factor of semiprimes in A089542.at n=15A089543
• Smallest prime factor of the n-th Fermat number F(n) = 2^(2^n) + 1.at n=6A093179
• Squarefree products of factors of Fermat numbers (A023394).at n=28A094358
• 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=20A128852
• Prime factors of 2^128 - 1.at n=6A176689
• a(n) is the smallest prime factor of n^n+1 having the form k*n+1.at n=14A187022
• The n-th Chebyshev primes that are equal to the 2n-th primes.at n=3A196675
• Smallest prime factor of 2^A219547(n) + 1.at n=6A219548
• Smallest prime factor of 2^A219547(n) + 1.at n=30A219548
• Smallest prime factor of 2^A219547(n) + 1.at n=43A219548
• Smallest prime factor of 2^(8n) + 1.at n=7A219549
• Smallest prime factor of 2^(8n) + 1.at n=39A219549
• Smallest prime factor of 2^(8n) + 1.at n=55A219549
• Smallest prime factor of composites in the sequence A000051(n) = 2^n+1.at n=58A242017