2625641

Properties

Appears in sequences

• Primes of the form k^4 + k^3 + k^2 + k + 1.at n=12A088548
• Primes of the form n^4 + n^3 + n^2 + n + 1 where n is nonprime.at n=6A193366
• a(n) = (40^n - 1)/39.at n=5A218743
• Primes of the form (k^p-1)/(k-1) not having representation in the form (m^q+1)/(m+1), where k,m > 1 and p,q > 2.at n=17A225148
• Primitive prime factors of the cyclotomic polynomial sequence Phi(5,k) in the order in which they occur.at n=40A256153
• a(n) = 1 + sigma(n) + sigma(n)^2 + sigma(n)^3 + sigma(n)^4.at n=26A258978
• Primes in A258978.at n=9A258980
• Primes of the form (40^k - 1) / 39.at n=1A292070
• Brazilian primes that are also the lesser of a pair of twin primes.at n=2A306849
• Prime numbersat n=191600