3000025

Appears in sequences

• Numbers that are n-gons for three or more n's, where n=3,4,5,...,16.at n=19A062712
• Doubly hexagonal numbers.at n=25A063249
• Triangular numbers which remain triangular when the most significant digit is moved to the end.at n=20A067269
• Numbers that have exactly 10 representations as a k-gonal number, P(n,k) = n*((k-2)*n - (k-4))/2, k and n >= 3.at n=14A321160
• a(n) is the least positive number k that can be written in exactly k ways as (x*y+1)*(x*z+1) with x > y > z > 1.at n=17A345215