{
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  "source": "vibemath",
  "problem_id": "vibemathed:composites-among-xi-7-n",
  "title": "Composites Among $[\\xi 7^n]$ and Right-Truncatable Primes in Base 7",
  "canonical_statement": "For every real $\\xi>0$ the sequence of integer parts $[\\xi 7^{n}]$, $n=0,1,2,\\dots$, contains infinitely many composite numbers. Second, there is no infinite right truncatable prime in base 7.",
  "plain_summary": "VibeMathed reports this item as resolved. VibeMath preserves that report as a source assertion and has not independently authored a plain-language mathematical explanation.",
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      "title": "On the composites among [ξ7ⁿ]",
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      "attempted_at": "2026-08-15T00:00:00.000Z",
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      "sources": [
        {
          "label": "VibeMathed: Composites Among $[\\xi 7^n]$ and Right-Truncatable Primes in Base 7",
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      "label": "VibeMathed: Composites Among $[\\xi 7^n]$ and Right-Truncatable Primes in Base 7",
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}