21559

Properties

Appears in sequences

• Powers of fifth root of 5 rounded up.at n=31A018128
• Second term of weak prime sextet: p(m)-p(m-1) < p(m+1)-p(m) < p(m+2)-p(m+1) < p(m+3)-p(m+2) < p(m+4)-p(m+3).at n=7A054829
• Primes with 15 as smallest positive primitive root.at n=5A061328
• Primes for which the smallest positive primitive root is odd and nonprime.at n=10A070269
• Number of permutations satisfying -k <= p(i) - i <= r and p(i) - i not in I, i=1..n, with k=3, r=3, I={1,2}.at n=15A079989
• Primes congruent to 24 mod 59.at n=38A142751
• Primes congruent to 26 mod 61.at n=33A142824
• Primes p of the form A152539(n) + 1.at n=31A152540
• Number of nondecreasing integer sequences of length 7 with sum zero and sum of absolute values 2n.at n=23A158141
• Primes p such that q*p+-Mod(p,q) are primes, for q=7.at n=29A178387
• Number of ordered triples (i,j,k) with |i|, |j|, |k|, |i*j*k| <= n.at n=39A226359
• Least prime p such that x^2 + 3*x + p produces primes for x = 0..n-1 but not x = n.at n=6A230663
• Sum of the first n strobogrammatic numbers.at n=24A230833
• Primes of the form 6*p + 1 with p prime that are also of the form x^2 + 27*y^2 and congruent to 7 mod 24.at n=26A256172
• Partial sums of A299289.at n=21A299290
• Primes p such that (p+2)/3 and (p+3)/2 are prime.at n=40A338410
• a(n) is the first prime p such that the sum of 2*n consecutive primes starting at p is (q-1)*q where q is prime, or 0 if there is no such p.at n=12A338990
• Prime numbersat n=2419