100725

Appears in sequences

• Sum of all terms on the two principal diagonals of a 2n+1 X 2n+1 square spiral.at n=26A114254
• Triangle T(n,k) read by rows of the smallest n-gonal number greater than 1 that is also k-gonal, or 0 if none exists, for 3 <= k <= n.at n=42A189216