25781083

Properties

Appears in sequences

• Largest prime factor of 2^n + 1.at n=37A002587
• Largest primitive factor of 2^(2n+1) + 1.at n=18A002589
• List of primitive prime divisors of the Jacobsthal numbers A001045 in their order of occurrence.at n=42A129738
• Numbers k (between 2^(m-1) and 2^m) such that 2^(k-1) == 1 (mod k) and 2^(k-1-m) == k - 2^p (mod k) for some p > 0 with 2^p < k.at n=42A167612
• Largest prime factor of the n-th Jacobsthal number, A001045(n).at n=34A271314
• a(n) is the largest prime factor of n*2^n+1 for n>0, and a(0)=1.at n=32A367005
• Primes p such that gcd(ord_p(2), ord_p(6)) = 1.at n=9A383467
• Prime numbersat n=1611654