18524

Appears in sequences

• Coordination sequence for hexagonal close-packing.at n=42A007899
• a(0) = 1, a(n) = 42*n^2 + 2 for n>0.at n=21A010023
• Smallest number a(n)>a(n-1) such that T(a(n-1))+T(a(n))=T(m) for some m, a(1)=3; T(i) are the triangular numbers.at n=29A072522
• Least integers that satisfy sum(n>0,1/a(n)^z)=0, where a(1)=1, a(n+1)>a(n) and z=I*2.at n=9A084816
• Number of 2 X 2 matrices having all terms in {1,...,n} and determinant in the closed interval [0,n].at n=21A211057
• Numbers n such that A182134(n) = 3, i.e., there exist only three primes p with prime(n) < p < prime(n)^(1 + 1/n).at n=42A246781
• Number of (n+1) X (4+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically.at n=11A253155
• Numbers n such that Bernoulli number B_{n} has denominator 690.at n=30A272186