What is the k'th term of 23, 60, 121, 206?
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What is the u'th term of 9, 24, 37, 48, 57, 64, 69?
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What is the u'th term of -114, -126, -140, -156, -174, -194, -216?
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What is the r'th term of -1851, -1846, -1831, -1800, -1747, -1666?
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What is the s'th term of 23, 30, 41, 56?
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What is the o'th term of 6940, 6939, 6938, 6937, 6936, 6935?
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What is the a'th term of 1095, 1094, 1101, 1122, 1163, 1230, 1329?
一个美术生