80939
domain: N
Appears in sequences
- Denominators of continued fraction convergents to sqrt(818).at n=10A042579
- n*10^5-1, n*10^5-3, n*10^5-7 and n*10^5-9 are all prime.at n=13A064979
- Number of obtuse triangles, distinct up to congruence, on an n X n grid (or geoboard).at n=28A190022
- a(n) = numerator of Sum_{i=1..n} 1/A171397(i).at n=9A375523