251789

Properties

Appears in sequences

• Smaller of twin primes whose middle term is a multiple of A002110(5)=2310.at n=19A060231
• Numbers k such that prime(k) == 1 (mod sigma(k)).at n=21A067697
• Numbers k such that prime(k) == 15 (mod k).at n=13A116662
• Primes p such that p+2, p*(p+2)+18 and p*(p+2)+20 are also prime.at n=24A130737
• Number of (n+2) X 8 0..1 matrices with each 3 X 3 subblock idempotent.at n=21A224557
• Primes p such that pi(p^2)*pi(q^2) is a square for some prime q < p, where pi(x) denotes the number of primes not exceeding x.at n=22A262700
• Prime numbersat n=22184