38737

Properties

Appears in sequences

• Largest prime factor of 2^n + 1.at n=36A002587
• Largest prime factor of 16^n + 1.at n=9A002590
• Primes p whose period of reciprocal equals (p-1)/9.at n=32A056214
• 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=19A086019
• Primes whose logarithms are known to possess binary BBP formulas.at n=34A104885
• Irregular triangle in which row n has all primes q such that prime(n)*q is a base-2 Fermat pseudoprime.at n=33A180471
• Greatest prime factor of n^9+1.at n=15A240552
• Primes having only {3, 7, 8} as digits.at n=34A260381
• Largest prime factor of 4^n + 1.at n=18A274903
• Largest prime factor of 8^n + 1.at n=12A274905
• Largest prime factor of 4^n - 1.at n=35A274906
• Largest prime factor of 8^n - 1.at n=23A274908
• a(n) = largest prime q such that q | 2^p - 2 and p - 1 | q - 1, where p = prime(n).at n=20A287945
• Prime divisors of 2^720 - 1.at n=25A291360
• Primes p such that the order of 2 mod p is less than the square root of p.at n=31A333245
• Prime numbers whose binary expansion involves powers of 2 with only composite (or zero) exponents.at n=41A342481
• a(n) is the largest prime factor of 2^(prime(n) - 1) - 1.at n=19A358699
• Prime numbersat n=4083