631125

Appears in sequences

• 9-gonal octagonal numbers.at n=1A048924
• 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=26A189216
• Least nonnegative number greater than the previous number which is simultaneously an n-gonal and (n+1)-gonal number.at n=8A342300
• Number of transitive relations on an n-set with exactly two ordered pairs.at n=34A349919
• Numbers that are both k-gonal and (k+1)-gonal for some k >= 3.at n=8A378245