3033169

Properties

Appears in sequences

• Largest prime factor of 2^n + 1.at n=29A002587
• Largest primitive factor of 2^(2n+1) + 1.at n=14A002589
• Numbers n such that game of n X n Button Madness need have no solution; this lists only the primitive elements of the set.at n=35A007802
• For p = prime(n), a(n) is the largest prime q such that pq is a base-2 pseudoprime; that is, 2^(pq-1) = 1 mod pq; a(n) is 0 if no such prime exists.at n=15A086019
• List of primitive prime divisors of the numbers (4^n-1)/3 (A002450) in their order of occurrence.at n=54A129735
• List of primitive prime divisors of the Jacobsthal numbers A001045 in their order of occurrence.at n=30A129738
• A list of primes written in order of their first appearance in a table of prime factorizations of 2^k+1, k=1,2,... .at n=35A158895
• 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=29A167612
• Irregular triangle in which row n has all primes q such that prime(n)*q is a base-2 Fermat pseudoprime.at n=22A180471
• Largest prime factor of the n-th Jacobsthal number, A001045(n).at n=26A271314
• Largest prime factor of 4^n - 1.at n=28A274906
• a(n) = largest prime q such that q | 2^p - 2 and p - 1 | q - 1, where p = prime(n).at n=16A287945
• a(n) is the largest prime factor of 2^(prime(n) - 1) - 1.at n=15A358699
• Prime numbersat n=219024