684757

Properties

Appears in sequences

• Primes of form (p^x - 1)/(p^y - 1), p prime.at n=37A003424
• Prime numbers that are the sum of the divisors of some n.at n=30A023195
• Primes of the form p^2 + p + 1 when p is prime.at n=19A053183
• Terms of A000203 that are prime.at n=32A062700
• Primes that can be written as 1+p+p^k, p prime and k > 1.at n=38A084444
• Primes of the form 1+(1+p)*p^e, p prime and e>0.at n=34A087196
• Primes p of the form p^2 + q - 1 where p < q are consecutive primes.at n=35A242231
• Primes p of the form sigma(2k-1) for a number k.at n=24A247837
• Primes q of the form sigma((p + 1) / 2) where p is a prime.at n=16A292448
• Primes q appearing in A330832: that is, if A330832(n)=p*q, where p is prime and q=(p^k-1)/(p-1) is prime, then a(n)=q.at n=37A330835
• Primes of the form (p^k)^2 + p^k + 1 with prime p and positive integer k.at n=22A342691
• Prime numbersat n=55414