Bug in HP 300s+: FACT on powers > 9

[Joe Horn]

The HP 300s+ has a FACT button which finds the prime factors of integers. For example, if you enter 10! and press = then press FACT, it displays 2^8 × 3^4 × 5^2 × 7. But FACT has a bug in it: The powers are always displayed in hex! (This is noticeable when the power is > 9, of course).

Examples:
2^15 = FACT --> 2^f
2^16 = FACT --> 2^10
2^33 = FACT --> 2^21
12! = FACT --> 2^a × 3^5 ... etc.

Although the HP 300s+ is often characterized as a rebranded Casio, I am unaware of any Casio model that has this bug.

Note: FACT only returns prime factors <1000. This is not a bug, but a documented function limitation, shared with Casio.