31481

Properties

Appears in sequences

• Numbers n such that the sum of the digits of the n-th Fibonacci number written in bases 2, 3, 5 and 7 is prime.at n=38A111064
• Primes of the form 2n^2+14n+5.at n=21A154577
• Larger of emirp pairs whose digital sums are also emirps (A178091).at n=39A178093
• n such that A205592(n) > n.at n=15A205594
• a(n) = smallest Ramanujan prime R_k in A104272 that is >= A000101(n).at n=13A214757
• Third prime p such that (p+n)^2+n is prime but (p+j)^2+j is not prime for all 0<j<n.at n=32A238675
• Primes p such that (p^2+2)/3 and (p^4+2)/3 are prime.at n=26A256811
• Numbers k such that k, prime(k) and primepi(reverse(prime(k))) are emirps (A006567).at n=4A382389
• Prime numbersat n=3388