22051

Properties

Appears in sequences

• A sequence of sorted odd primes 3 = p_1 < p_2 < ... < p_m such that p_i-2 divides the product p_1*p_2*...*p_(i-1) of the earlier primes and each prime factor of p_i-1 is a prime factor of twice the product.at n=16A001259
• Numbers k such that (19^k - 1)/18 is prime.at n=9A006035
• Primes that remain prime through 3 iterations of function f(x) = 3x + 8.at n=17A023279
• Primes that remain prime through 4 iterations of function f(x) = 3x + 8.at n=2A023309
• Least m such that if r and s in {1/1, 1/4, 1/9,..., 1/n^2} satisfy r < s, then r < k/m < s for some integer k.at n=38A024827
• Base 5 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,0.at n=6A037506
• Smallest k>1 such that k(p-1)-1 is divisible by p^2, p=n-th prime.at n=34A039914
• Denominators of continued fraction convergents to sqrt(219).at n=9A041409
• Denominators of continued fraction convergents to sqrt(453).at n=8A041863
• Denominators of continued fraction convergents to sqrt(876).at n=9A042693
• Primes p such that p-12, p and p+12 are consecutive primes.at n=22A053072
• 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={0,2}.at n=15A079993
• Primes such that successive differences are increasing palindromes.at n=20A087581
• Primes of the form 2*n^2+1.at n=20A090698
• Primes of the form p^2 - p - 1, where p is prime.at n=16A091568
• Initial members of 25 consecutive primes in a 5 X 5 spiral wherein the mean of all 12 sums is prime.at n=37A094458
• a(n) = n-th centered n-gonal number.at n=35A100119
• Largest prime divisor of numerator of the n-th Artin's product.at n=35A119534
• Largest prime divisor of numerator of the n-th Artin's product.at n=34A119534
• Largest prime divisor of numerator of the n-th Artin's product.at n=33A119534