179951

Properties

Appears in sequences

• a(n) = least primitive factor of 2^(2n+1) - 1.at n=29A002184
• Smallest prime factor of Mersenne numbers 2^p-1, where p is prime.at n=16A016047
• Smallest prime dividing 2^n - 1.at n=57A049479
• Triangle read by rows formed by the prime factors of Mersenne number 2^prime(n) - 1, n >= 1.at n=28A089162
• Smallest prime factor of composite Mersenne numbers: lpf(2^p-1) where 2^p-1 is composite and p is prime.at n=8A136030
• Smallest prime factor of 2^n - 1 having the form k*n + 1.at n=57A186522
• Primes of the form 2*n^2 + 74*n + 35.at n=34A217500
• Smallest prime factor of A135972(n), the n-th composite Mersenne number.at n=49A242016
• Prime factors of 2^A054723(n)-1, ordered by increasing n, then by increasing size of the factors.at n=20A244453
• a(n) is the smallest k > n such that 2^(k-n) == 1 (mod k).at n=60A344681
• Smallest number with reciprocal of period length n in base 8.at n=59A381493
• Prime numbersat n=16336