34537

Properties

Appears in sequences

• Class 8- primes.at n=3A081427
• Numbers n such that 8*10^n + 7*R_n + 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=17A103091
• Least odd prime a(n) such that (a(n)*M(n))^2 + a(n)*M(n) - 1 is prime with M(n) = Mersenne-primes (A000043).at n=19A107709
• K-bit primes p such that p-2^i and p+2^i are composite for 0<=i<=K-1.at n=22A153352
• Primes p such that p + 4, p + 16, p + 64, p + 256 and p + 1024 are all semiprimes.at n=28A241493
• Number of length-n 0..3 arrays with no repeated value differing from the previous repeated value by other than plus two or minus 1.at n=7A269635
• T(n,k)=Number of length-n 0..k arrays with no repeated value differing from the previous repeated value by other than plus two or minus 1.at n=52A269640
• Compound filter: a(n) = P(sigma(n), sigma(2n)), where P(n,k) is sequence A000027 used as a pairing function, and sigma is the sum of divisors (A000203).at n=43A286359
• Primes p such that A001175(p) = 2*(p+1)/7.at n=35A308785
• Prime numbersat n=3690