579883

Properties

Appears in sequences

• Primes of form (p^x - 1)/(p^y - 1), p prime.at n=35A003424
• Prime numbers that are the sum of the divisors of some n.at n=28A023195
• Primes of the form p^2 + p + 1 when p is prime.at n=17A053183
• Terms of A000203 that are prime.at n=30A062700
• Primes that can be written as 1+p+p^k, p prime and k > 1.at n=36A084444
• Primes of the form 1+(1+p)*p^e, p prime and e>0.at n=32A087196
• Primes p of the form sigma(2k-1) for a number k.at n=22A247837
• Primes p such that there is prime q with sigma(q+2) = p.at n=13A247955
• Pseudo-safe-primes: numbers n = 2m+1 with 2^m congruent to n+1 or 3n-1 modulo m*n, but m composite.at n=14A300193
• 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=35A330835
• Primes of the form (p^k)^2 + p^k + 1 with prime p and positive integer k.at n=20A342691
• Prime numbersat n=47580