28591

Properties

Appears in sequences

• Primes that remain prime through 3 iterations of function f(x) = 3x + 8.at n=22A023279
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 90 ones.at n=33A031858
• Initial term in sequence of four consecutive primes separated by 3 consecutive differences each <=6 (i.e., when d = 2, 4 or 6) and forming d-pattern = [6, 6, 4]; short d-string notation of pattern = [664].at n=19A078858
• Primes p such that the sum of the digits of p is not prime, but the sum of each digit raised to the 4th power is prime.at n=29A091368
• D'Agapeyeff cipher.at n=1A135209
• Numbers n with property that n^2 starts and ends with 81.at n=8A159775
• Primes p such that p*floor(p/2)-2 and p*floor(p/2)+2 are also prime numbers.at n=37A164621
• Number of 4X2 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 4 zero-sum 2-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=35A192703
• Number of binary arrays indicating the locations of trailing edge maxima of a random length-n 0..5 array extended with zeros and convolved with 1,-2,1.at n=18A222150
• Primes p such that p^4-p^3+1 and p^4-p^3-1 are also primes.at n=10A238136
• Number of 1-separable partitions of n; see Comments.at n=50A239467
• Prime numbersat n=3111