Funny math problem to calculate the Pin Number for a credit card.

[Werner]

It is well-known that the numerical integration in, I think, all its HP implementations (from 34C onwards) never evaluates the endpoints. Free42 and, by extension, the DM42 are such faithful simulators that they of course mimic that, too.
But I did try it out on a real 42S of course. No problem whatsoever.

Code:

00 { 41-Byte Prgm }
01▸LBL "FX"
02 MVAR "X"
03 RCL "X"
04 ENTER
05 STO ST Z
06 3
07 ×
08 1
09 -
10 ×
11 2
12 +
13 ×
14 4
15 -
16 X<>Y
17 X^2
18 3
19 LASTX
20 ×
21 -
22 2
23 +
24 SQRT
25 ÷
26 END

With ACC= 0.0001 I get -2.98125065973

Cheers, Werner