2555904
domain: N
Appears in sequences
- Products of exactly 18 primes (generalization of semiprimes).at n=21A069279
- a(n) = 2^(n-3)*(n^2+3*n+8).at n=16A072863
- Denominator of expansion of RiemannSiegelTheta(t) about infinity.at n=6A114721
- Number of catacondensed hexagonal systems with n hexagons.at n=16A121286
- a(n) = (n-4)*(n-3)*2^(n-2).at n=16A181407
- Number of 4-cycles in the n-Sierpinski tetrahedron graph.at n=9A292542
- a(n) is the least k such that A161606(k) = n or a(n) = -1 if no such k exists.at n=18A385677
- Smallest integer k whose sum of its distinct prime factors and bigomega(k) both equal n; or -1 if no such integer exists.at n=16A386605