{
  "index": "1953-B-1",
  "type": "ANA",
  "tag": [
    "ANA"
  ],
  "difficulty": "",
  "question": "1. Is the infinite series\n\\[\n\\sum_{n=1}^{\\infty} \\frac{1}{n^{(n+1) / n}}\n\\]\nconvergent? Prove your statement.",
  "solution": "Solution. For every positive integer \\( n, n<2^{\\prime \\prime} \\). Hence \\( n^{1 \"}<2 \\), so\n\\[\n\\frac{1}{n^{(n+1) n}}>\\frac{1}{2 n} .\n\\]\n\nSince \\( \\sum_{n}^{\\infty} \\frac{1}{2 n} \\) diverges, so does \\( \\sum_{n}^{\\infty} \\frac{1}{n^{(n+1) n}} \\).",
  "vars": [
    "n"
  ],
  "params": [],
  "sci_consts": [],
  "variants": {
    "descriptive_long": {
      "map": {
        "n": "indexer"
      },
      "question": "1. Is the infinite series\n\\[\n\\sum_{indexer=1}^{\\infty} \\frac{1}{indexer^{(indexer+1) / indexer}}\n\\]\nconvergent? Prove your statement.",
      "solution": "Solution. For every positive integer \\( indexer, indexer<2^{\\prime \\prime} \\). Hence \\( indexer^{1 \\\"}<2 \\), so\n\\[\n\\frac{1}{indexer^{(indexer+1) indexer}}>\\frac{1}{2 indexer} .\n\\]\n\nSince \\( \\sum_{indexer}^{\\infty} \\frac{1}{2 indexer} \\) diverges, so does \\( \\sum_{indexer}^{\\infty} \\frac{1}{indexer^{(indexer+1) indexer}} \\)."
    },
    "descriptive_long_confusing": {
      "map": {
        "n": "butterfly"
      },
      "question": "1. Is the infinite series\n\\[\n\\sum_{butterfly=1}^{\\infty} \\frac{1}{butterfly^{(butterfly+1) / butterfly}}\n\\]\nconvergent? Prove your statement.",
      "solution": "Solution. For every positive integer \\( butterfly, butterfly<2^{\\prime \\prime} \\). Hence \\( butterfly^{1 \\\"}<2 \\), so\n\\[\n\\frac{1}{butterfly^{(butterfly+1) butterfly}}>\\frac{1}{2 butterfly} .\n\\]\n\nSince \\( \\sum_{butterfly}^{\\infty} \\frac{1}{2 butterfly} \\) diverges, so does \\( \\sum_{butterfly}^{\\infty} \\frac{1}{butterfly^{(butterfly+1) butterfly}} \\)."
    },
    "descriptive_long_misleading": {
      "map": {
        "n": "unnatural"
      },
      "question": "1. Is the infinite series\n\\[\n\\sum_{unnatural=1}^{\\infty} \\frac{1}{\\unnatural^{(\\unnatural+1) / \\unnatural}}\n\\]\nconvergent? Prove your statement.",
      "solution": "Solution. For every positive integer \\( \\unnatural, \\unnatural<2^{\\prime \\prime} \\). Hence \\( \\unnatural^{1 \"}<2 \\), so\n\\[\n\\frac{1}{\\unnatural^{(\\unnatural+1) \\unnatural}}>\\frac{1}{2 \\unnatural} .\n\\]\n\nSince \\( \\sum_{\\unnatural}^{\\infty} \\frac{1}{2 \\unnatural} \\) diverges, so does \\( \\sum_{\\unnatural}^{\\infty} \\frac{1}{\\unnatural^{(\\unnatural+1) \\unnatural}} \\)."
    },
    "garbled_string": {
      "map": {
        "n": "qzxwvtnp"
      },
      "question": "Problem:\n<<<\n1. Is the infinite series\n\\[\n\\sum_{qzxwvtnp=1}^{\\infty} \\frac{1}{qzxwvtnp^{(qzxwvtnp+1) / qzxwvtnp}}\n\\]\nconvergent? Prove your statement.\n>>>\n",
      "solution": "Solution:\n<<<\nSolution. For every positive integer \\( qzxwvtnp, qzxwvtnp<2^{\\prime \\prime} \\). Hence \\( qzxwvtnp^{1 \\\"}<2 \\), so\n\\[\n\\frac{1}{qzxwvtnp^{(qzxwvtnp+1) qzxwvtnp}}>\\frac{1}{2 qzxwvtnp} .\n\\]\n\nSince \\( \\sum_{qzxwvtnp}^{\\infty} \\frac{1}{2 qzxwvtnp} \\) diverges, so does \\( \\sum_{qzxwvtnp}^{\\infty} \\frac{1}{qzxwvtnp^{(qzxwvtnp+1) qzxwvtnp}} \\).\n>>>\n"
    },
    "kernel_variant": {
      "question": "Let f : ℕ → ℝ satisfy |f(n)| ≤ √n for every n.  Decide whether the series  \n  ∑_{n=1}^{∞} 1 / n^{(n+f(n))/n}  \nconverges.  Prove your conclusion.",
      "solution": "Solution.  Since |f(n)| ≤ n^{1/2}, we have n^{|f(n)|/n} ≤ n^{1/√n} < 4.  Consequently,  \n1/n^{(n+f(n))/n} ≥ 1/(4n).  Therefore, by the Comparison Test, the series diverges.",
      "_replacement_note": {
        "replaced_at": "2025-07-05T22:17:12.114925",
        "reason": "Original kernel variant was too easy compared to the original problem"
      }
    }
  },
  "checked": true,
  "problem_type": "proof"
}