18919

Properties

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 84 ones.at n=14A031852
• "DGK" (bracelet, element, unlabeled) transform of 2,1,1,1,...at n=30A032232
• a(n) is the number of forests with n nodes of rooted unlabeled identity trees.at n=15A052843
• Numbers k such that 10^999 + k is a (titanic) prime.at n=11A074282
• Last term of prime quadruples.at n=17A090258
• Let p = prime(sigma(n)) and q = prime(phi(n)), then p is in the sequence if p-q = 6.at n=24A103176
• prime(k) for those k where floor((2*(prime(k+1)-prime(k))*PrimePi(k) mod (8*k))/k) = m with m = 8.at n=35A109562
• Numbers n such that p(9n) is prime, where p(n) is the number of partitions of n.at n=28A114169
• Primes for which the level is equal to 9 in A117563.at n=41A118481
• Prime sums of 5 positive 5th powers.at n=40A123034
• Primes p such that q-p = 28, where q is the next prime after p.at n=16A124595
• Primes of the form 55x^2+10xy+199y^2.at n=36A140632
• Primes congruent to 39 mod 59.at n=35A142766
• Primes congruent to 9 mod 61.at n=36A142807
• Primes of the form m*(m+1)/2 + 4.at n=32A159048
• Number of strings of numbers x(i=1..8) in 0..n with sum i*x(i)^4 equal to 8*n^4.at n=19A184852
• Primes of the form 7n^2 - 9.at n=11A201854
• Sum of digits of n^(n!).at n=7A202358
• Primes p such that p-2 and q are primes, where q is concatenation of binary representations of p and p-2: q = p * 2^L + p-2, where L is the length of binary representation of p-2: L=A070939(p-2).at n=25A232237
• Egyptian fraction representation of sqrt(44) (A010498) using a greedy function.at n=4A248270