101520

Appears in sequences

• a(n) = (7*n+3)*(7*n+5)*(7*n+6).at n=6A001561
• Numbers k that divide the (left) concatenation of all numbers <= k written in base 19 (most significant digit on left).at n=58A029488
• Deterministic completely defined quasi-acyclic automata with 3 inputs, n transient and k absorbing labeled states.at n=30A082170
• Triangle read by rows giving coefficients of polynomials arising in successive differences of central binomial numbers.at n=27A094796
• Expansion of E.g.f.: 1/sqrt(1-2*x-3*x^2).at n=6A098461
• The greedy sequence of real numbers at least 1 that do not contain any 3-term geometric progressions with integer ratio.at n=44A235054
• a(n) = sigma(A291789(n)).at n=18A291804
• Square array T(n,k), n>=0, k>=0, read by antidiagonals, where T(n,k) is the constant term in the expansion of (-1 + Product_{j=1..n} (1 + x_j + 1/x_j))^k.at n=39A327751
• Constant term in the expansion of (-1 + (1 + x + 1/x) * (1 + y + 1/y) * (1 + z + 1/z))^n.at n=5A328874
• Triangular array, read by rows: T(n,k) = [(x*y*z)^k] (-1 + (1 + x + 1/x)*(1 + y + 1/y)*(1 + z + 1/z))^n for -n <= k <= n.at n=30A329819