18403

Appears in sequences

• T(n,n-5), where T is the array in A055830.at n=20A055832
• Number of 5k+4 primes (A030433) in range ]2^n,2^(n+1)].at n=19A095024
• Smallest m such that A116452(m) = n.at n=12A116454
• Numerators of increasingly better rational approximations to log(3)/log(2) with increasing denominators.at n=19A254351
• Least positive integer k such that prime(prime(prime(k)))+ prime(prime(prime(k*n))) = 2*prime(prime(p)) for some prime p.at n=33A261583
• Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic residues mod p that are < p/2.at n=25A282721
• Number of ways to choose a constant rooted partition of each part in a rooted partition of n.at n=22A301762
• Number of weak orderings of (i,j), 1 <= i,j <= n, for which there is a set X = {x_1<...<x_n} of n real numbers with (i,j) < (k,m) if and only if x_i + x_j < x_k + x_m.at n=5A378609