103887

Appears in sequences

• Numbers k such that sigma(k) = sigma(k+7).at n=29A015867
• Triangle read by rows: number of atomic set compositions of size n and length k (see description in A095989) 1 <= k <= n.at n=32A109062
• Number of fixed triangular n-ominoes of the regular tiling with Schläfli symbol {3,6} that have a common axis of symmetry coincident with cell altitudes and the point of the polyomino farthest along that axis in a specified direction is a cell vertex.at n=25A364486