31931
domain: N
Appears in sequences
- Maximal number of regions obtained by joining n points around a circle by straight lines. Also number of regions in 4-space formed by n-1 hyperplanes.at n=30A000127
- Place n equally-spaced points around a circle and join every pair of points by a chord; this divides the circle into a(n) regions.at n=30A006533
- Numbers n such that 2*p(n)+3, 2*p(n+1)+3, 2*p(n+2)+3 are consecutive primes, where p(i) denotes the i-th prime.at n=24A088066
- Number of partitions of n such that (greatest part) <= (multiplicity of least part).at n=50A240182
- Infinitary Ruth-Aaron numbers: numbers k such that A181894(k) = A181894(k+1).at n=22A330999
- Unitary Ruth-Aaron numbers: numbers k such that A008475(k) = A008475(k+1).at n=21A331000
- T(n,k) is the number of connected posets of n unlabeled elements with k covering relations (n>=1, k>=0). Triangle read by rows.at n=70A342590