21619
domain: N
Appears in sequences
- Powers of fifth root of 4 rounded to nearest integer.at n=36A018124
- Powers of fifth root of 4 rounded up.at n=36A018125
- Powers of fifth root of 8 rounded to nearest integer.at n=24A018136
- Powers of fifth root of 8 rounded up.at n=24A018137
- Powers of fifth root of 16 rounded to nearest integer.at n=18A018160
- Powers of fifth root of 16 rounded up.at n=18A018161
- a(n) = (d(n)-r(n))/2, where d = A026043 and r is the periodic sequence with fundamental period (1,1,0,0).at n=47A026044
- Number of partitions of n in which number of parts is not 2.at n=37A058984
- Positions of hexagonal pyramidal numbers in the EKG sequence.at n=31A144080
- Number of 2 X 2 matrices having all terms in {1,...,n} and determinant >= 2n.at n=15A211062
- Number of partitions of n+2 with largest inscribed rectangle having area <= n.at n=35A218623
- a(n) is the number of unlabeled rank-3 graded lattices with 5 coatoms and n atoms.at n=13A322600
- 2^(6*n/5) rounded to nearest integer.at n=11A324586
- a(n) is the upper end of a record gap A349995(n) between consecutive odd squarefree semiprimes (A046388).at n=9A350099
- Number of integer partitions of n that are not of length 2 and do not contain n/2.at n=37A365825