72901

Properties

Appears in sequences

• Primes of the form p*q+2 where p and q are consecutive primes.at n=11A048880
• Primes of form pq + 2 where p and q are twin primes.at n=5A051779
• Primes p such that (p-1) and the period length of 1/p are both squares.at n=27A076516
• Primes of form (prime(n)^2 + prime(n+1)^2)/2.at n=11A093343
• Numbers n such that the numbers of divisors of n,n+1,n+2 and n+3 are k,2k,4k,8k respectively for some k.at n=33A100364
• Primes associated with A127435.at n=18A127436
• Prime averages of two successive perfect prime powers.at n=10A131697
• Primes of the form prime(x)*prime(x+1) + (prime(x+1)-prime(x)).at n=13A140121
• Primes of the form 9*n^2 + 1.at n=16A156226
• Primes of the form p^2 + 2*p + 2 where p is prime.at n=16A157467
• Primes of the form m^2+1 such that m^2-7 = prevprime(m^2) (= A007917(m^2)).at n=5A157935
• a(n) is the least number such that k = n*a(n) has sum of digits n and ends with the digit string n, or 0 if no such number exists.at n=40A175690
• Largest prime p[i] such that p[i]+p[i+1]+...+p[i+n-1] <= primorial(n) = A002110(n).at n=6A196128
• Primes whose base-9 representation also is the base-3 representation of a prime.at n=37A235472
• Primes whose base-9 representation also is the base-4 representation of a prime.at n=28A235619
• A239459(n) / n.at n=26A239462
• Primes p such that gcd(phi(p-1), sigma(p-1)) = 1 with phi = A000010, sigma = A000203.at n=31A270539
• Löschian numbers (A003136) of the form k^2+1.at n=23A271184
• a(n) = 1 + 100*n^2 for n >= 0.at n=27A323178
• Prime terms of A338820.at n=16A338102