401856
domain: N
Appears in sequences
- Ramanujan's tau function (or Ramanujan numbers, or tau numbers).at n=13A000594
- a(1) = 6 and then the smallest triangular numbers, larger than the previous term, such that sum of two neighbors is also a triangular number.at n=8A072521
- The even bisection of A000594.at n=6A099060
- Triangular numbers which are 10-almost primes.at n=7A101744
- Triangular numbers that are sums of twin prime pairs.at n=28A165966
- Dirichlet inverse of Ramanujan's L-series (A000594).at n=13A181104
- Refactorable triangular numbers.at n=41A272524