13264529

Properties

Appears in sequences

• a(n) = largest noncomposite factor of 2^(2n+1) - 1.at n=23A002588
• Largest prime factor of n-th Mersenne number (A001348(n)).at n=14A003260
• Divisors of 2^47 - 1.at n=4A003552
• If Mersenne numbers have 3 or more factors, then list the third factor.at n=2A089159
• Triangle read by rows formed by the prime factors of Mersenne number 2^prime(n) - 1, n >= 1.at n=24A089162
• Largest prime factor of composite Mersenne numbers.at n=6A136031
• Duplicate of A136031.at n=6A145098
• Primes p such that (p-1)/ord(2,p) > (q-1)/ord(2,q) for odd primes q < p.at n=25A226216
• Prime factors of 2^A054723(n)-1, ordered by increasing n, then by increasing size of the factors.at n=16A244453
• 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=14A247229
• Prime numbersat n=865318