316410
domain: N
Appears in sequences
- Hexagonal numbers for which both the sum of the digits and the product of the digits are also hexagonal numbers.at n=33A117064
- Triangular numbers that are sandwiched between two semiprimes; or triangular numbers t such that t-1 and t+1 are both semiprime.at n=30A121898
- Triangular numbers that are the sum of two distinct nonzero triangular numbers in exactly two ways.at n=31A350368
- Triangular numbers that are sandwiched between two squarefree semiprimes.at n=28A375384