2099863

Properties

Appears in sequences

• a(n) = largest noncomposite factor of 2^(2n+1) - 1.at n=21A002588
• Largest prime factor of n-th Mersenne number (A001348(n)).at n=13A003260
• Divisors of 2^43 - 1.at n=3A003548
• If Mersenne numbers have 3 or more factors, then list the third factor.at n=1A089159
• Triangle read by rows formed by the prime factors of Mersenne number 2^prime(n) - 1, n >= 1.at n=21A089162
• Largest prime factor of composite Mersenne numbers.at n=5A136031
• Sturdy prime numbers: p such that in binary notation k*p has at least as many 1-bits as p for all k > 0.at n=18A143027
• Duplicate of A136031.at n=5A145098
• Primes p such that (p-1)/ord(2,p) > (q-1)/ord(2,q) for odd primes q < p.at n=21A226216
• Prime factors of 2^A054723(n)-1, ordered by increasing n, then by increasing size of the factors.at n=13A244453
• Minimum of the greatest prime factors of (i^prime(n)-1)/(i-1), when i runs through all integers in [2, prime(n)].at n=13A247229
• Smallest prime p for which n is the least number of 1's in the base-2 representation of a multiple of p.at n=7A308730
• Prime numbersat n=155798