66921
domain: N
Appears in sequences
- Start of record gap in odd semiprimes A046315.at n=12A114057
- 9800*n^2-5740*n-4059.at n=2A118061
- a(n) = 2*A000129(n) - 1.at n=12A133654
- a(n)=a(n-1)+3a(n-2)+a(n-3).at n=14A137199
- The index of the first of two consecutive positive triangular numbers (A000217) the sum of which is equal to the sum of four consecutive positive triangular numbers.at n=5A262490
- a(n) is the lower end of a record gap A349995(n) between consecutive odd squarefree semiprimes (A046388).at n=11A350098