Open 3-dimensional ball numbers (version 1): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (0,0,0).
A053592
Open 3-dimensional ball numbers (version 1): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (0,0,0).
Terms
- a(0) =0a(1) =1a(2) =1a(3) =19a(4) =27a(5) =81a(6) =93a(7) =179a(8) =251a(9) =389a(10) =485a(11) =739a(12) =895a(13) =1189a(14) =1365a(15) =1791a(16) =2103a(17) =2553a(18) =2969a(19) =3695a(20) =4139a(21) =4945a(22) =5497a(23) =6403a(24) =7123a(25) =8217a(26) =9093a(27) =10395a(28) =11459a(29) =12893
External references
- oeis: A053592