perplexus.info :: Algorithms : Tautonymic number counting

Tautonymic number counting (Posted on 2022-09-04)

Suppose you want to know how many tautonymic numbers are in the set of integers from 1 to N.

Can you provide a formula for this?
Otherwise, can you devise an algorithm, as efficient as possible, to find the answer?
Are there special values of N for which there is a simple formula?

See The Solution Submitted by K Sengupta

Rating: 5.0000 (1 votes)

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