19202

Appears in sequences

• Number of points on surface of hexagonal prism: 12*n^2 + 2 for n > 0 (coordination sequence for W(2)).at n=40A005914
• Numbers whose cubes contain more than half the same digit and do not end in 0.at n=38A060814
• Square spiral of sums of selected preceding terms, starting at 0 followed by 1 (a spiral Fibonacci-like sequence).at n=20A094769
• a(n) is the area of the triangle with sides prime(n), prime(n+2) and prime(n+4), rounded down to the nearest integer.at n=41A096384
• Number of points in the standard root system version of the D_3 (or f.c.c.) lattice having L_infinity norm n.at n=40A110907
• a(n) = 49*n^2 - 20*n + 2.at n=19A157373
• Triangle T(n, k) = A154646(n,k) - A154646(n,0) + 1, 0 <= k <= n.at n=22A174599
• Triangle T(n, k) = A154646(n,k) - A154646(n,0) + 1, 0 <= k <= n.at n=26A174599
• Put the natural numbers together without spaces and read them five at a time advancing one space each time.at n=27A193493
• a(n) is the first prime index where the gap between R(n), Riemann's prime counting function, and Pi(n), the exact prime counting function, is greater than n.at n=7A226473
• a(n) = Sum_{k=0..floor(n/4)} binomial(n,4*k)*binomial(5*k,k)/(4*k+1).at n=14A227035