What is the d'th term of -843, -1686, -2531, -3378, -4227, -5078, -5931?
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What is the l'th term of -586, -1203, -1820?
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What is the y'th term of 39, 45, 49, 51, 51?
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What is the d'th term of -15, -16, -9, 12, 53, 120, 219, 356?
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What is the i'th term of -15, -72, -191, -396, -711, -1160, -1767, -2556?
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What is the q'th term of -17, -143, -493, -1181, -2321, -4027, -6413, -9593?
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What is the u'th term of 25992, 25990, 25988, 25986?
一个美术生