deleted 14 characters in body

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edited May 23, 2017 at 14:33

Octave, 23 bytes

@(n)sum(1:sqrt(2*n))==n

This is an anonyous function that returns true (displayed as 1) for triangular numbers and false (0) otherwise.

@(n)sum(1:sqrt(2*n))==n

@(n)sum(1:sqrt(2*n))==n

This is an anonyous function that returns true (displayed as 1) for triangular numbers and false (0) otherwise.

deleted 14 characters in body

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edited May 23, 2017 at 14:27

Octave, 3223 bytes

@(n)nnz(pdist(sum(01:sqrt(2*n)^.5)'))==n

@(n)nnz(pdist((0:(2*n)^.5)'))==n

@(n)sum(1:sqrt(2*n))==n

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created May 23, 2017 at 13:49

@(n)nnz(pdist((0:(2*n)^.5)'))==n