Perhaps this will be useful to someone: if you think that in addition to the final value, you are also required to have the initial value, think again.

man. someone else always came up with such elegant solutions.

im learning a lot of math doing these types of kata's. I liked this one it made me think.

hehe, needed this after the previous one i did ;-;

The error message format is:
your answer should equal expected answer none of those two values is the input.

Erm some of these tests are a bit wrong, I think.

-287575764675 should equal 95858588225

How? Shouldn't -287575764675 equal 287575764675?!

The description of the problem contains a link to Wikipedia with a ready-made solution to the problem.

Method is missing the argument definition at the top in Ruby.

Ah that makes perfect sense! Thanks!

Could someone explain why this works? I don't understand. I used the abs() function, but this is so simple and sleek

damn

some interesting solutions here!

Thank you