I went all the way to ID49 and remained in between 48 and 49 and corruption was not as strong as in CoC. I know what I'm saying.
This is from GB, and it's a spoiler.
In the Infinite dungeon, N is 20 for levels 10-29, 15 for levels 30-49, 10 for levels 50-69, 5 for levels 70-89, and 2 for levels 90 and above. For other areas, N is 20 for DL 10-19, 15 for DL 20-29, 10 for DL 30-39, 5 for DL 40-44, and 2 for DL 45 and above.
The N is a multiplier. The smaller the number, the faster the corruption gets. Notice how multiplier becomes 2 when you are above CoC45, and it becomes 2 once you're over ID 90. ID dungeon does not take danger levels (but dungeon levels) into its corruption formula. ID is roughly twice as tolerant and corruption-safe to you, compared to any other dungeon.