19051

Properties

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 68 ones.at n=33A031836
• Primes of the form k^2 + 7.at n=37A079138
• Number of transitive relations on n unlabeled points.at n=6A091073
• Numbers k such that (5^k - 3^k)/2 = A005059(k) is prime.at n=12A121877
• Prime numbers p such that p +- ((p-1)/5) are primes.at n=16A137714
• Primes congruent to 24 mod 53.at n=35A142554
• Primes congruent to 53 mod 59.at n=36A142780
• Primes congruent to 19 mod 61.at n=32A142817
• Primes p such that p^2 - 2 is a 5-almost prime.at n=29A156620
• a(n) = (4*n^3 - 9*n^2 + 11*n + 3)/3.at n=25A161707
• Emirps whose only prime digits are 5's.at n=29A179036
• Emirps with a 5 as the only prime digit.at n=23A179037
• Cyclops emirps.at n=31A183057
• Primes of the form 9n^2 + 7.at n=13A201707
• Last occurrence of n partitions in A204814.at n=32A205301
• Primes p such that f(f(p)) is prime where f(x) = x^8 + 1.at n=35A236070
• Primes p with prime(p)^2 + (2*p)^2 and p^2 + (2*prime(p))^2 both prime.at n=39A236193
• Number of partitions of 2*n into exactly n squarefree parts.at n=49A341153
• Discriminants of imaginary quadratic fields with class number 27 (negated).at n=37A351665
• Primes p such that, if q is the next prime, p^2 + q is a prime times a power of 10.at n=19A352852