21700501

Properties

Appears in sequences

• Primes of the form k^4 + k^3 + k^2 + k + 1.at n=18A088548
• Primes of the form n^4 + n^3 + n^2 + n + 1 where n is nonprime.at n=11A193366
• 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=26A225148
• Primes in A258978.at n=17A258980
• Prime numbersat n=1371459