19541

Properties

Appears in sequences

• Fibonacci sequence beginning 2, 11.at n=17A022115
• Primes that remain prime through 4 iterations of function f(x) = 4x + 9.at n=8A023312
• Primes that remain prime through 5 iterations of function f(x) = 4x + 9.at n=1A023340
• Least prime in A001359 (lesser of twin primes) such that the distance (A053319) to the next twin is 6*n.at n=25A052350
• Primes p such that 2^p-1 and the p-th Fibonacci number have a common factor. Prime terms of A074776.at n=8A080050
• Lower bound twin primes such that their digital reverse is prime and a lower bound twin prime.at n=35A101783
• A variation on Flavius's sieves (A000960, A099207): Start with the Chen primes; at the k-th sieving step, remove every (k+1)-st term of the sequence remaining after the (k-1)-st sieving step; iterate.at n=36A118500
• Lesser of a twin-prime pair where both are expressible as the sum of two triangular numbers.at n=36A118638
• Primes of the form 256 k + 85.at n=19A127593
• Sum of squares of five consecutive primes.at n=15A131686
• Primes which have a partition as the sum of squares of five consecutive primes.at n=5A133559
• Primes congruent to 12 mod 59.at n=38A142739
• Primes congruent to 21 mod 61.at n=37A142819
• The smaller member of a twin prime pair in which both primes are emirps.at n=37A175215
• Emirps whose only prime digits are 5's.at n=30A179036
• Emirps with a 5 as the only prime digit.at n=24A179037
• Mountain emirps.at n=23A182721
• Number of zero-sum nX3 -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors.at n=4A202042
• Number of zero-sum nX5 -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors.at n=2A202044
• T(n,k)=Number of zero-sum nXk -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors.at n=23A202047