What is the f'th term of -2, 4, 4, -2?
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What is the l'th term of 110, 105, 104, 107, 114, 125, 140?
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What is the r'th term of -31, -29, -27?
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What is the o'th term of -30, 15, 86, 195, 354, 575?
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What is the o'th term of 1597, 3194, 4791, 6388?
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What is the l'th term of -107, -70, 27, 214, 521, 978?
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What is the m'th term of -5, -12, -21, -32, -45, -60?
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