Simplest suggestion is an arithmetic series Each term of the series increases (or decreases) by a constant amount
You need the series to sum to 180 (to go from 75 to 255) For n terms the sum is 0.5*n*(a[1]+a[n]) Therefore for 30 terms, a[30]=12-a[1] Also, a[n]=a[1]+d*(n-1) where d is the constant increment Therefore a[30]=a[1]+29*d and thus d=(12-2*a[1])/29 There is an infinite variety of starting numbers and increments to get you to the final destination. For example, pick a[1]=11, then d= -0.3448. Or pick d=-1, then a[1]=20.5. But there is a caveat in that your terms can go negative, I presume you want to keep them positive so you need to have a[30]=12-a[1]>0 ie, a[1]<12 regards, Martin P.S., mathworld.wolfram.com is your friend for anything like this
In other words, say I start with 75 and I know I want to have 30 steps between 75 and 255 that get progressively smaller down to 1. How I determine the value of each step?
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