49185
domain: N
Appears in sequences
- Number of primitive subsequences of {1, 2, ..., n}.at n=23A051026
- Numbers k for which 2*k-1, 4*k-1, 8*k-1 and 16*k-1 are primes.at n=35A124494
- Triangle read by rows: T(n,k) is the number of Dyck paths with no UUU's and no DDD's, of semilength n and having k UUDUDD's starting at level 0 (0 <= k <= floor(n/3); U=(1,1), D=(1,-1)).at n=45A166295
- Number of Dyck paths of semilength n with no UUU's and no DDD's and having no UUDUDD's starting at level 0 (U=(1,1), D=(1,-1)).at n=15A166296
- Fibonacci sequence beginning 13, 11.at n=18A206607
- Numbers m such that m^2 divides 2^k - 1 for some k, 0 < k <= m.at n=21A246503
- Growth series for affine Coxeter group (or affine Weyl group) D_4.at n=41A266759
- Number of regions formed when n equally spaced points are placed around a circle and all pairs of points are joined by an interior arc whose radius equals the circle's radius.at n=31A371253