I am one higher then pent up,
and a curse on your enemies.
The last civilization used me well,
and, out loud, a core of mathematics.
What am I?
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Hex
I am one higher than pent up
The next highest numerical prefix after "pent-" is "hex-".
and a curse on your enemies
"Hex" is a term for a curse.
The last civilization used me well
Civilization V used hexagonal tiles with some success according to critics. (Thanks to Dan Russell on that one.)
and, out loud, a core of mathematics
When spoken, some dialects pronounce "hex" and "x" very similar. $x$ is an incredibly common variable name in algebra.
Are you:
Hex
I am one higher than pent up
Pent + 1 = Hex
and a curse on your enemies
A hex on all y'all!
The last civilization used me well
Civ V the game went to hexagonal tiles
and, out loud, a core of mathematics
Hexadecimal encoding
I think the answer is
hex
I am one higher then pent up,
pent a prefix for five, hex a prefix for six
and a curse on your enemies.
hex is synonymous with curse
The last civilization used me well,
Referring to Greece?
and, out loud, a core of mathematics.
hexadecimal