What is the k'th term of -2, 3, 8, 13?
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What is the t'th term of 3, -2, -11, -24, -41?
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What is the f'th term of 167, 159, 147, 131, 111?
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What is the h'th term of 29, 163, 491, 1109, 2113, 3599, 5663, 8401?
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What is the b'th term of 17, 28, 47, 74, 109?
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What is the b'th term of 450, 899, 1348, 1797?
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What is the u'th term of -164, -169, -176, -185, -196, -209, -224?
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