What is the k'th term of -3, -18, -45, -84, -135, -198?
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What is the f'th term of 323, 353, 385, 419?
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What is the i'th term of 63, 199, 419, 717, 1087?
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What is the q'th term of -20, -7, 36, 121, 260?
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What is the a'th term of 921, 915, 895, 855, 789, 691?
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What is the u'th term of -1517, -1510, -1501, -1490, -1477?
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What is the c'th term of -13, -10, 9, 50, 119, 222, 365, 554?
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