398580

Appears in sequences

• Numbers that are repdigits in base 9.at n=46A048334
• Number of closed walks of length n along the edges of a tetrahedron based at a vertex.at n=13A054878
• a(n) = 3*(9^n - 1)/4.at n=6A054880
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,41.at n=23A064257
• Partial sums of A080925.at n=12A080926
• Numbers n such that A081249(m)/m^2 has a local maximum for m = n.at n=11A081251
• Partial sums of A132357.at n=12A135266
• a(n) = a(n-1) + 2*a(n-2) - 2*a(n-3) + 3*a(n-4) - 3*a(n-5), where a(0) = 1, a(1) = 3, a(2) = 6, a(3) = 11, a(4) = 20, a(5) = 33.at n=22A297443
• a(n) = a(n-1) + 9*a(n-2) - 9*a(n-3), where a(0) = 1, a(1) = 3, a(2) = 6, a(3) = 33.at n=12A297444