Palindromes in Decimal and Binary

Phone ScreenxAILast reported October 2024Low Frequency
Reported
3× across candidate reports
First seen
October 2024
Last reported
October 2024
Reported outcome
unknown

Problem Overview

Find all integers from 1 to 100,000 that are palindromes in both their decimal (base-10) and binary (base-2) representations. In the observed xAI phone-screen format this is presented as a sequence of multiple-choice evaluations of AI-generated responses, with the candidate reasoning aloud: (1) given several…

  • 2 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
  • The rest of the problem statement — full requirements, constraints, and edge cases
  • Approach and trade-offs — what passing candidates did, and the mistakes that sink people
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Verified Source
Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.
Codex Fact-Checked
Technical claims, formulas, and scale numbers are reviewed against primary sources.
Interviewer Follow-ups
The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.
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