28351

Properties

Appears in sequences

• Primes that remain prime through 3 iterations of function f(x) = 3x + 8.at n=21A023279
• Primes p such that x^5 = 2 has a solution mod p, but x^(5^2) = 2 has no solution mod p.at n=18A070182
• Primes p such that p-1 and p+1 are both divisible by fourth powers.at n=17A086709
• Primes in which the unit place digit is 1 and the k-th most significant digit is prime (2,3,5,7) if k is prime else is composite (4,6,8,9,0).at n=39A089704
• prime(k) for those k where floor((2*(prime(k+1)-prime(k))*PrimePi(k) mod (8*k))/k) = m with m = 10.at n=30A109564
• Diagonal sums of Bessel related triangle A122848.at n=18A122849
• a(1) = 1; for n>1, a(n) = the smallest number p > a(n-1) such that (a(n-1)+p)/2 is a cube.at n=29A126950
• Numbers that appear exactly five times in A101402. (Also indices of fives in A101403.).at n=19A129117
• Primes p such that q-p = 36, where q is the next prime after p.at n=10A134117
• Primes p such that p*floor(p/2) - 4 and p*floor(p/2) + 4 are prime numbers.at n=34A164622
• a(n) is the smallest prime q such that, for the previous prime p and the following prime r, the fraction (q-p)/(r-q) has denominator n (or 0, if such a prime does not exist).at n=17A168253
• a(n) is the smallest prime q such that (r-q)/(q-p) = n, where p<q<r are consecutive primes (or 0 if no such prime exists).at n=17A179210
• Primes p such that q = 2*p^2 - 1 and 2*p*q - 1 are also prime.at n=43A224990
• Sum of squares of cycle lengths for different cycles in Fibonacci-like sequences modulo n.at n=30A233246
• Number of (n+2)X(4+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two minimums of the central column and central row nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=8A254903
• a(1) = 2. For n>1, let s denote the binary string of a(n-1) with the leftmost 1 and following consecutive 0's removed. Then a(n) is the smallest prime not yet present whose binary representation begins with s.at n=48A262350
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 825", based on the 5-celled von Neumann neighborhood.at n=16A284185
• Primes introducing new second differences in A036263.at n=42A295973
• Trajectory of n under the Reverse and Add! operation carried out in base 8 (presumably) does not reach a palindrome and (presumably) does not join the trajectory of any term m < n.at n=33A306596
• Number of partitions of n with two sorts of part 1 which are introduced in ascending order.at n=15A320733