I solved the first test suite symbolically to make sure I was on the right path an got:
[1.0, 6.4839432567518947511762312927844, 9.0049224364695494006414430797622, 8.992494072596270056922480305016, 6.9752731606055591524878412503205, 3.6901871946858786387135688683041, 0].
I am not sure why it would be wrong.
Dy = diff(y);
Sorry David. I made a mistake with the signs in the last term of the equation. I "modified" the problem description (quotes intentional). This version should work, but please let me know if it doesn't.
Sums with Excluded Digits
Longest Divisor Run
Least common multiple of many numbers
pressure to dB?
Function composition - harder
Characterize the final state of the digit inventory sequence
Determine whether a number is a fibodiv number
Investigate the frequency of last non-zero digits of primorials
Count unique orderings of vertices of a polygon
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