902496

Appears in sequences

• Triangular numbers which are 9-almost primes.at n=19A076583
• a(1) = 1; for n > 1, a(n) = smallest triangular number which is n times another triangular number > 1, or -1 if no such number exists.at n=31A077672
• Triangular numbers representable as t*p, where t>1 is a triangular number, p>1 is a prime power (A025475).at n=9A221563