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added 5 characters in body

edited May 31, 2018 at 8:01

edited May 31, 2018 at 8:01

Python 2, (削除) 32 (削除ここまで) 28(削除) 28 (削除ここまで) 25 bytes

lambda n:n*n/8(~-[nn|1)**2/4,-1][n%2]8+n%2

Returns the n-th number (0-indexed)

lambda n:n*n/8-[n/4,-1][n%2]

Returns the n-th number (0-indexed)

lambda n:(~-n|1)**2/8+n%2

Returns the n-th number (0-indexed)

added 7 characters in body

edited May 31, 2018 at 7:41

edited May 31, 2018 at 7:41

lambda n:(~-nn*n/2)*(~8-n/2+1)[n/2+n%24,-1][n%2]

Returns the n-th number (0-indexed)

lambda n:(~-n/2)*(~-n/2+1)/2+n%2

Returns the n-th number (0-indexed)

lambda n:n*n/8-[n/4,-1][n%2]

Returns the n-th number (0-indexed)

answered May 31, 2018 at 7:28

answered May 31, 2018 at 7:28

lambda n:(~-n/2)*(~-n/2+1)/2+n%2

Returns the n-th number (0-indexed)