18374

Appears in sequences

• Numerators of continued fraction convergents to sqrt(565).at n=6A042082
• n*10^2-1, n*10^2-3, n*10^2-7 and n*10^2-9 are all prime.at n=25A064976
• Semiprimes that are the sum of 10 consecutive primes.at n=25A185347
• Composite numbers k such that phi(x) = psi(k)*phi(k) has no solution.at n=12A292714
• Number of compositions of n with circular differences all equal to 1, 0, or -1.at n=19A325591
• Draw a regular n-gon and the enclosing circle, then for each pair of vertices X, Y, draw a circle with diameter XY; the union of these figures is the graph H_n; sequence gives number of regions in H_n.at n=18A370978