A program / service that looks for a mathematical pattern in numbers?

Question

Mathematics

Tell me a program or service for calculating mathematical patterns from a series of 6-digit numbers?

Answer 1

From the comments, it became clear that the question is about 6-digit codes generated by Google Authenticator.
Here (in English) they tell what algorithms are used in Google Authenticator: HOTP and TOTP algorithms .
On Habré there is a material about the generation of one-time passwords. The Google Authenticator code is open - study for health.
Since these numbers are derived from hashes, there is no numerical pattern to them.