18771

Appears in sequences

• p^2 + 2 where p is a prime.at n=32A061725
• a(n+1) = a(n)+greatest prime divisor of a(n-1).at n=45A078695
• a(n) = 137*a(n-1) + a(n-2), with a(0) = 2 and a(1) = 137.at n=2A087619
• Terms in A061725 that are of form 3*prime.at n=12A133395
• a(n) = 52*n^2 - 1.at n=18A158640
• Number of times that the numerator of a sum generated from the set 1, 1/2, 1/3,..., 1/n is a Fibonacci number.at n=27A256220
• Numbers k such that k![4] + 2 is prime, where k![4] = A007662(k) = quadruple factorial.at n=40A283553
• Semiprimes of the form k^2 + 2.at n=38A360739
• The number of possible values that can be obtained for the Shannon diversity index across all partitions of n.at n=42A383683