19031

Properties

Appears in sequences

• Primes that are palindromic in base 11.at n=27A029978
• Primes that are each the sum of two, three, and four consecutive composite numbers.at n=24A060339
• List of Ormiston prime pairs.at n=5A072274
• Prime numbers p such that p+6, p^2+6^2, p^4+6^4 are all primes.at n=11A107441
• Primes congruent to 33 mod 59.at n=38A142760
• Primes congruent to 60 mod 61.at n=31A142858
• Primes p such that the multiplicative order of 2 modulo p is (p-1)/10.at n=30A152310
• Primes of the form n^2 - 13.at n=15A154648
• Primes of the form prime(k)^2 + 2*prime(k-1) where prime(k) is the k-th prime number.at n=11A155820
• Number of n X 3 binary arrays with rows and columns in nondecreasing order.at n=10A184138
• Irregular array read by rows. a(n) is the largest element in the primitive Collatz-like 3x-k cycle associated with A226623(n).at n=19A226624
• Primes p congruent to 11 mod 12 such that (p - 1)/2 does not divide the numerator of the Bernoulli number B(p-1).at n=12A232040
• a(n) = (2^p+1)^(p-1) modulo p^2, where p is prime(n).at n=39A260531
• a(n) = smallest prime q such that Sum_{primes p <= q} 1/sqrt(p) >= n.at n=36A292775
• Primes of the form p=3*q+3*r+q*r where q and r are distinct primes and 2*p-3*q, 2*p-3*r and 2*p-q*r are also prime.at n=36A328822
• Start from the sequence of primes, keep the 1st, then delete 2 primes, keep the next, delete 3 primes, keep the next, delete 5 primes, etc ...at n=34A350170
• Number of partitions of n in which exactly one even part is repeated and odd parts are unrestricted.at n=39A353902
• Numbers k such that (45^k + 2^k)/47 is prime.at n=5A380131
• Prime numbersat n=2162