I guessed the output for
But my guess was wrong. See the screenshot:
And I tried to construct such function as pure-function, but failed.
A workaround (not as pure-function) is
Seq[x_] := Sequence[x, 7]
Q1) Why does the code
Sequence[#, 7]&) fail ?
Q2) Is it possible to construct such function as a pure-function ?