373680domain: NAppears in sequencesTriangular numbers which are 9-almost primes.at n=9A076583Triangular numbers representable as x*y+x+y such that x and y are triangular numbers, x>=y>1.at n=36A259746Refactorable triangular numbers.at n=38A272524Number of unordered pairs of strict integer partitions of n.at n=38A366317