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#3 languages (1 byte) - Pyth (A001477), MATL (A000027), Braingolf (A000217)

Q

• Try Pyth online!, 0-indexed (non-negative integers)
• Try MATL online!, 0-indexes (positive integers)
• Try Braingolf online!, 1-indexed (triangular numbers)

#How?

Q does the following:

• In MATL, it means + 1, so it basically evaluates to input + 1.

• In Pyth, it means input, so it just outputs the input.

• In Braingolf, it is the built-in for triangular numbers.