Created
December 7, 2022 15:44
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| from math import floor, sqrt | |
| def lattice_inside(N):#give square of the radius,i.e., R = \sqrt(N) | |
| summ = 0; | |
| loop_no = int(N/3) + 2 | |
| for i in range(0,loop_no+1): | |
| a = floor(N/(3*i+1)) | |
| b = floor(N/(3*i+2)) | |
| # print(a,b,i) | |
| summ = summ + 6*(a-b) | |
| return summ + 1 | |
| def lattice_on(N): | |
| return lattice_inside(N)-lattice_inside(N-1) | |
| print(lattice_on(7)) |
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