1873080
domain: N
Appears in sequences
- Triangular numbers which are 9-almost primes.at n=27A076583
- Triangular numbers that are the product of 4 distinct triangular numbers greater than 1.at n=10A226501
- Numbers k such that Sum_{d|k} nphi(d) = k where the sum is over nonunitary divisors of k and nphi(k) is the nonunitary totient function (A254503).at n=2A319800
- Triangular numbers T(i) that can be expressed as the sum of 2 positive triangular numbers, T(j)+T(k), and for which i+j+k is a triangular number, where T is A000217.at n=21A343426