277140
domain: N
Appears in sequences
- Triangular numbers that are sandwiched between two semiprimes; or triangular numbers t such that t-1 and t+1 are both semiprime.at n=28A121898
- Triangular numbers that are sums of twin prime pairs.at n=24A165966
- Triangular numbers which are sums of 6 consecutive primes.at n=18A173423
- Triangular numbers that are sandwiched between two squarefree semiprimes.at n=26A375384