400960

Appears in sequences

• Triangular numbers which are 9-almost primes.at n=10A076583
• Triangular numbers such that moving the first digit to the end produces a square number.at n=5A133197
• Refactorable triangular numbers.at n=40A272524
• Numbers that have exactly 8 representations as a k-gonal number, P(m,k) = m*((k-2)*m - (k-4))/2, k and m >= 3.at n=23A321158