28792661

Properties

Appears in sequences

• Primes of the form sigma(m^2) where m is a composite number ordered by values m.at n=17A065403
• Primes of the form k^4 + k^3 + k^2 + k + 1.at n=19A088548
• a(n) = 1 + prime(n) + prime(n)^2 + prime(n)^3 + prime(n)^4.at n=20A131992
• Primes of the form p^4 + p^3 + p^2 + p + 1, where p is prime.at n=7A190527
• 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=28A225148
• Primes p of the form sigma(2q-1) where q is a prime.at n=20A247836
• Primes p such that there is prime q with sigma(q+2) = p.at n=25A247955
• Sophie Germain primes which are Brazilian.at n=0A306845
• Prime numbersat n=1787624