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added 31 characters in body

edited Jul 18, 2017 at 20:43

edited Jul 18, 2017 at 20:43

Python 2, 24(削除) 24 (削除ここまで) 16 bytes

-8 bytes thanks to FryAmTheEggman.

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

lambda n:sum(range(n+1))

-8 bytes thanks to FryAmTheEggman.

lambda n:n*-~n/2

Post Undeleted by totallyhuman

occurred Jul 18, 2017 at 20:41

Post Deleted by totallyhuman

occurred Jul 18, 2017 at 20:40

answered Jul 18, 2017 at 20:40

answered Jul 18, 2017 at 20:40

lambda n:sum(range(n+1))