126756
domain: N
Appears in sequences
- Triangular numbers for which the number of divisors is also a triangular number.at n=30A116541
- Triangular numbers representable as b! + c^2.at n=41A230364
- Triangular numbers (A000217) that are the sum of eight consecutive triangular numbers.at n=4A257712
- Refactorable triangular numbers.at n=26A272524
- The first of three consecutive triangular numbers the sum of which is equal to the sum of three consecutive primes.at n=37A298168
- Dirichlet g.f.: Product_{k>=2} 1 / (1 - k^(-s))^binomial(k+4,5).at n=24A344205
- Triangular numbers such that the three numbers before it and the three numbers after it are squarefree.at n=15A374393